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Construction and demolition waste management contributing factors coupled with reduce, reuse, and recycle strategies for effective waste management: A review

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Construction and demolition waste (C&DW) as a direct consequence of rapid urbanization is increasing around the world. C&DW generation has been identified as one of the major issues in the construction industry due to its direct impacts on the environment as well as the efficiency of construction industry. It is estimated that an overall of 35% of C&DW is landfilled globally, therefore, effective C&DW management is crucial in order to minimize detrimental impacts of C&DW for the environment. As the industry cannot continue to practice if the resources on which it depends are depleted, C&DW management needs to be implemented in an effective way. Despite considering many well-developed strategies for C&DW management, the outputs of the implementation of these strategies is far from optimum. The main reason of this inefficiency is due to inadequate understanding of principal factors, which play a vital role in C&DW management. Therefore, the aim of this research is to critically scrutinize the concept of C&DW and its managerial issues in a systematic way to come up with the effective C&DW management. In order to achieve this aim, and based on a systematic review of 97 research papers relevant to effective C&DW management, this research considers two main categories as fundamental factors affecting C&DW management namely, C&DW management hierarchy including reduce, reuse, and recycle strategies, and effective C&DW management contributing factors, including C&DW management from sustainability perspective, C&DW stakeholders’ attitudes, C&DW project life cycle, and C&DW management tools. Subsequently, these factors are discussed in detail and findings are scrutinized in order to clarify current and future practices of C&DW management from both academic and practical perspectives.
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Construction and demolition waste management contributing factors coupled with 1
reduce, reuse, and recycle strategies for effective waste management: A Review 2
Kamyar Kabirifar a*, Mohammad Mojtahedi b, Changxin Wang c, Vivian W. Y. Tam d 3
a,b,c Faculty of Built Environment, University of New South Wales, Sydney, Australia 4
d School of Built Environment, Western Sydney University, Sydney, Australia 5
6
a Faculty of Built Environment, University of New South Wales; Sydney, Australia; kamyar.kabirifar@unsw.edu.au 7
b Faculty of Built Environment, University of New South Wales, Sydney, Australia; m.mojtahedi@unsw.edu.au 8
c Faculty of Built Environment, University of New South Wales, Sydney, Australia; cynthia.wang@unsw.edu.au 9
d Department of Built Environment, Western Sydney University, Sydney, Australia; v.tam@westernsydney.edu.au 10
*Correspondence: kamyar.kabirifar@student.unsw.edu.au 11
Abstract: 12
Construction and demolition waste (C&DW) as a direct consequence of rapid urbanization is increasing around the 13
world. C&DW generation has been identified as one of the major issues in the construction industry due to its 14
direct impacts on the environment as well as the efficiency of construction industry. It is estimated that an overall 15
of 35% of C&DW is landfilled globally, therefore, effective C&DW management is crucial in order to minimize 16
detrimental impacts of C&DW for the environment. As the industry cannot continue to practice if the resources on 17
which it depends are depleted, C&DW management needs to be implemented in an effective way. Despite 18
considering many well-developed strategies for C&DW management, the outputs of the implementation of these 19
strategies is far from optimum. The main reason of this inefficiency is due to inadequate understanding of principal 20
factors, which play a vital role in C&DW management. Therefore, the aim of this research is to critically scrutinize 21
the concept of C&DW and its managerial issues in a systematic way to come up with the effective C&DW 22
management. In order to achieve this aim, and based on a systematic review of 97 research papers relevant to 23
effective C&DW management, this research considers two main categories as fundamental factors affecting C&DW 24
management namely, C&DW management hierarchy including reduce, reuse, and recycle strategies, and effective 25
C&DW management contributing factors, including C&DW management from sustainability perspective, C&DW 26
stakeholders’ attitudes, C&DW project life cycle, and C&DW management tools. Subsequently, these factors are 27
discussed in detail and findings are scrutinized in order to clarify current and future practices of C&DW 28
management from both academic and practical perspectives. 29
Keywords: Construction and Demolition Waste Management, Construction and Demolition Waste Management 30
Hierarchy, Effective Construction and Demolition Waste Management Contributing Factors, Effective 31
Construction and Demolition Waste Management 32
1. Introduction33
One of the most widespread definitions of construction and demolition waste (C&DW) provided by 34
(Tchobanoglous et al., 1977) emphasizes on demolition wastes as wastes arise from razed structures, 35
however, regarding construction waste, it is defined as wastes from construction, renovation, and 36
repairing of individual premises, commercial buildings, and other types of buildings. Skoyles and 37
Skoyles (1987) defined C&DW as a material or a by-product of the construction process, which is 38
generated due to non-conformity with the specifications, non-use or excessive utilization of resources, 39
and damage of the resources and infrastructure and this material should be evacuated from 40
construction site to another place or it can be utilized on construction site but rather than the initial aim 41
of the project. It is difficult to estimate the quantities of produced C&DW and they are various in 42
composition, however, may include concrete, bricks, dirt, stones, plaster, lumber, shingles, plumbing, 43
and electrical parts (Gavilan and Bernold, 1994). Another definition of C&DW is introduced by (Shen 44
et al., 2004) as “Debris generated in buildings, earth, rubble, steel, concrete, wood, and mixed materials 45
in construction sites, generating from different activities in construction sites encompassing excavation 46
For citationa:
Kabirifar, K.,Mojtahedi, M.,Wang, C. and Tam, V. W.Y. (2020), Construction and demolition waste management
contributing factors coupled with reduce, reuse, and recycle strategies for effective waste management: A
review, Journal of Cleaner Production, April, 2020 (263). https://doi.org/10.1016/j.jclepro.2020.121265
2
of lands, construction of buildings and structures, clearance of site, activities pertaining to demolition, 47
roadwork, and renovation of buildings”. In addition, (Poon and Chan, 2007) described C&DW as a 48
compound of inert and non-inert materials. For instance, soil and slurry are classified as soft inert 49
materials, while concrete particles and rocks are classified as hard inert materials. Meanwhile, inert 50
materials include materials such as packaging waste, plastics, and timber. C&DW is also defined as 51
solid waste, which is produced within construction activities, particularly, the waste that stems from 52
the processes of construction, renovation and demolition (Yuan and Shen, 2011, Park and Tucker, 2017). 53
In general, C&DW is explained as a combination of various materials, containing non-inert waste, inert 54
waste, non-hazardous waste and hazardous waste. C&DW is also referred to the materials that might 55
inadvertently be engendered by natural disasters, such as floods, hurricanes, earthquakes, and 56
tsunamis (Menegaki and Damigos, 2018). Furthermore, some other researchers define or classify 57
C&DW in a similar way with regard to the types of materials including in each category, the potential 58
for reusing, recovering and recycling of materials, or within a localized context (del Río Merino et al., 59
2010, Coelho and de Brito, 2011, Yuan and Shen, 2011, Mercante et al., 2012, Saez et al., 2013, Marzouk 60
and Azab, 2014, Butera et al., 2015, Karunasena and Amaratunga, 2016, Esa et al., 2017a, Ghafourian et 61
al., 2017, Ulubeyli et al., 2017, Won and Cheng, 2017, Yuan, 2017, Chen et al., 2018, Gálvez-Martos et 62
al., 2018, Yazdanbakhsh, 2018, Menegaki and Damigos, 2018, Bandeira et al., 2019, Blaisi, 2019, Jin et 63
al., 2019, Wu et al., 2019b, Wu et al., 2019c). Meanwhile, EPA America (Environmental Protection 64
Agency) defines C&DW as a classification of waste which is autonomous from municipal solid waste. 65
Bases on this definition, C&DW include materials, such as steel, concrete, asphalt, asphalt shingles, 66
wood, drywall and plaster, brick and clay tile (Prairie Village, 1998). These types of materials are 67
applied in buildings, roads and bridges, and other infrastructures (Akhtar and Sarmah, 2018). EPA 68
Australia (Environment Protection Authority) describes C&DW as; solid waste caused by C&D works, 69
containing waste from building and demolition activities, asphalt and excavated material (Pickin et al., 70
2018). 71
Based on the most recent available data, it is estimated that 333 million tonnes of C&DW (excluding 72
soils) was generated in European Union in 2014 (Menegaki and Damigos, 2018).In this context, C&DW 73
is categorized into nine groups including ferric metals, non-ferric metals, mixed ferric and non-ferric 74
metals, wood, plastic, glass, polychlorinated biphenyl waste, mineral wastes containing asbestos, and 75
finally, waste from C&D from all activities. In addition, Germany with 85 million tonnes, France with 76
65 million tonnes, and the United Kingdom with 58 million tonnes were the top three C&DW generators 77
in European Union (Menegaki and Damigos, 2018). 78
China generated 1130 million tonnes of C&DW in 2014 and is ranked as the first C&DW generator 79
worldwide, while, 534 million tonnes of C&DW was engendered in the United States in 2014 including 80
building activities, construction of road and bridges and other construction activities, from which 28.9 81
million tonnes through construction and 505.1 million tonnes through demolition activities 82
encompassing concrete, steel, wood products, brick and clay tile, drywall and plasters, and asphalt 83
shingles (Menegaki and Damigos, 2018). Meanwhile, in 2016-2017 Australia generated more than 20 84
million tonnes of C&DW approximately (Pickin et al., 2018). Table1 presents the top nine C&DW 85
generators worldwide. 86
Table1: C&DW generation worldwide (Menegaki and Damigos, 2018, The World Bank, 2018a, The World Bank, 87
2018b, The World Bank, 2018c) 88
ID Country
C&DW generation
(million tonnes) Area (km2)
Population 2018
(million)
GDP 2018 (billion
USD)
1
Hong Kong
20
1,050
7.4
363
3
2
Australia
20.4
7,692,020
25
1,434
3
Netherlands
22
33,690
17.2
914
4
Italy
39
294,140
60.5
2,084
5
United Kingdom
58
241,930
66.5
2,855
6
France
65
547,557
67
2,778
7
Germany
86
349,360
83
3,948
8
United States
534
9,147,420
327
20,544
9
China
1130
9,388,210
1393
13,608
From the above-mentioned statistics, it is concluded that there is a direct relationship between 89
population size, and economy-related activities with the quantity of generated C&DW, as the top 90
C&DW generators worldwide are among the big economies. Furthermore, it is worth mentioning that 91
evidence indicates that the construction industry generates about 44% of landfill waste in the United 92
Kingdom, 44% in Australia, 40% in Brazil, 29% in the United States, 27% in Canada and 25% in Hong 93
Kong (Ann et al., 2013, Yeheyis et al., 2013, Ajayi et al., 2016, Menegaki and Damigos, 2018). Generally, 94
it is estimated that the overall global average of C&DW is about 35% (Solís-Guzmán et al., 2009, Ajayi 95
et al., 2016), which is alarming when considering both the quantities of C&DW and detrimental impacts 96
of C&DW on the environment. 97
Managing C&DW in an effective way is a critical component in order to save our environment, natural 98
resources, economy, society, etc. Many researches have been carried out in the area of C&DW 99
management by focusing on C&DW management hierarchy including reduce, reuse, and recycle 100
strategies, which is known as a fundamental principal of C&DW management and by considering one 101
or a combination of these factors (Huang et al., 2018), however, this seems not to be adequate in order 102
to effectively manage C&DW (Ajayi et al., 2015, Esa et al., 2017a). Moreover, several other researches 103
have focused on C&DW management influencing factors, however, most of these studies (Li and Yang, 104
2014, Wang et al., 2014, Ramlee et al., 2016, Akinade et al., 2017, Banihashemi et al., 2017, Chen and Lu, 105
2017, Kalutara et al., 2017, Nikmehr et al., 2017, Udawatta et al., 2018, Yuan et al., 2018) lack of organized 106
and systematic classification, especially with regard to effective C&DW management. Despite these 107
previous researches in the area of C&DW management, less attention has been paid to the identification 108
and categorization of factors contributing to the effective C&DW management in a systematic way. It 109
is impossible to effectively manage C&DW without considering C&DW management hierarchy and 110
C&DW management contributing factors, because they both have same directions, and overlaps 111
regarding C&DW management and should be incorporated. Therefore, this research aims at critically 112
discuss the concept of effective C&DW and its contributing factors from managerial perspective. The 113
following research questions need to be addressed in the context of C&DW management hierarchical 114
strategies and C&DW management contributing factors. 115
1. What are the factors that affecting C&DW management? and; 116
2. What is the proposed model for effective C&DW management? 117
This review has an impressive value from both academic and practical point of view. Firstly, because 118
by the identification and categorization of effective C&DW management factors, a clear picture of 119
current and future status and practices in the domain of C&DW management research is drawn, which 120
helps academics to direct their future research on C&DW management by considering these factors. 121
Next, organizations engaged in C&DW management, can benefit from this research by considering 122
factors that affect C&DW management efficiency within their organizations in order to enhance their 123
level of performance. 124
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2. Construction and Demolition Waste Management Literature Taxonomy 125
Based on the aim of this research, C&DW management literature taxonomy should be formed in order 126
to answer two main questions, including the factors that affect C&DW management and the proposed 127
model for effective C&DW management. In order to answer these questions, this research initially 128
considers C&DW definitions and generation, then, the research areas of previous studies in C&DW 129
management are discussed, which give a clear picture about the domain of previous research practices 130
in the area of C&DW management. In this step and based on the research gap of this study, research 131
questions and research aim of this study are discussed in detail. In the next step, research methodology 132
is described and subsequently, in the following steps of this research, discussions and conclusions will 133
be conducted. In order to effectively manage C&DW, incorporation of effective C&DW management 134
contributing factors and C&DW management hierarchy is essential. Figure1 represents the proposed 135
C&DW literature taxonomy. 136
137
138
Figure1: Proposed Taxonomy for construction and demolition waste management literature review 139
3. Construction and Demolition Waste Management Research Background140
The C&DW issues during the past decades have gained growing awareness from industry and 141
researchers around the world. Despite lots of efforts in the past couple of years, it is evaluated that the 142
construction industry is still in its early phases and yet to mature to effectively help alleviate the 143
environmental burden (Li, 2011). The strategy to minimize the C&DW generation in an effective and 144
efficient manner is a dilemma encountered with many countries around the world. Significant research 145
efforts have been dedicated to C&DW minimization since 1980s, in order to reduce detrimental effects 146
of C&DW of building structures (Yuan, 2012). 147
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In order to have a clear understanding of previously conducted researches in the area of C&DW 148
management and research boundaries of C&DW, considering the C&DW management frameworks 149
developed by researchers is necessary. For instance, (Couto and Couto, 2010) developed a framework 150
to improve C&DW management in Portugal considering C&DW project life cycle and project 151
stakeholders. Another framework was developed by (Lu and Yuan, 2011), in which, research 152
boundaries for C&DW management were described. This framework covers amounts, origins, and 153
impacts of C&DW management, C&DW reduce, reuse, and recycle strategies, C&DW tools, humans154
role, performance and regulatory environment. In addition, C&DW management with regard to project 155
life cycle and stakeholders have also been addressed in this framework. Similarly, (Yuan and Shen, 156
2011), considered a framework for C&DW management hierarchy including reduction, reuse, recycling 157
and disposal. Moreover, (Yeheyis et al., 2013) developed a framework for C&DW life cycle assessment 158
in Canada, utilized. Similarly, (Calvo et al., 2014) developed a framework for C&DW management in 159
Spain, and (Karunasena and Amaratunga, 2016) considered a framework for post disaster C&DW 160
management in Sri Lanka, and (Huang et al., 2018) developed a framework for C&DW management in 161
China through 3Rs principle. Furthermore, (Gálvez-Martos et al., 2018) developed a framework for 162
environmental management practices of C&DW in Europe. In the meantime, in order to effectively 163
manage C&DW, (Wu et al., 2019c) conducted a research to assess C&DW management effectiveness 164
based on three different levels namely, national level, city level and project level. For instance, in the 165
national level, the effectiveness of methods in the construction industry of Hong Kong was 166
investigated. In that study, gained benefits, critical difficulties and important measures to encourage 167
C&DW management were identified (Tam, 2008). In another study, a framework was proposed by 168
(Yuan, 2013b) in order to assess C&DW effectiveness. In a research carried out by (Saez et al., 2013), 169
effectiveness of best practices of C&DW management was evaluated, including industrialised system 170
utilization, contract issues with suppliers managing C&DW, and containers distribution in the working 171
area. Another study conducted by (Ajayi et al., 2015) at the industry level, explored hampering factors 172
for effective C&DW management regarding developing plans for reducing waste in the construction 173
industry. Other studies have focused on performance measurement of C&DW management (Reza et 174
al., 2011, Mercante et al., 2012, Wu et al., 2015, Butera et al., 2015, Kucukvar et al., 2016, Marrero et al., 175
2017, Vitale et al., 2017, Lu et al., 2017, Neto et al., 2017, Yuan et al., 2018, Borghi et al., 2018, Wu et al., 176
2019a), however, in the domain of effectively manage C&DW, considering effective contributing factors 177
and their systematic classification and categorization is crucial, which has not fully been carried out in 178
the previous researches. 179
Some scholars have considered C&DW management from hierarchical perspective including C&DW 180
reduction strategy, C&DW reuse strategy, and C&DW recycle strategy. For instance, (Park and Tucker, 181
2017) considered waste reduction strategy as the most efficient waste minimization strategy. However, 182
some C&DW are inevitably produced, therefore, C&DW reuse and recycling as pragmatic managerial 183
strategies should be implemented in order to reduce waste going to landfills (Yuan and Shen, 2011). 184
C&DW reuse is called to the process of reusing same construction material more than once even in 185
different roles and if this generated waste cannot be reused, conversion of these materials to new 186
materials through recycling should be performed. The merits of C&DW management are numerous 187
including preserving the environment from pollution and degradation, economic advantages, less 188
energy consumption, less emissions, etc (Guerrero et al., 2013, Park and Tucker, 2017, Huang et al., 189
2018). Some other researchers have studied other contributing factors to C&DW management. For 190
instance, identifying the construction activities through which, reusable construction materials can be 191
accommodated (del Río Merino et al., 2010), having waste target for all associated trades (Marinelli et 192
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al., 2014), having recycling targets for each construction project (Oyedele et al., 2013), utilization of 193
facilities with the capacity of safe storage of materials and on-site environmental performance 194
monitoring and control (Dainty and Brooke, 2004, Ekanayake and Ofori, 2004), prevention of over 195
ordering of materials and removing remaining soil in reusable materials (Begum et al., 2007, Begum et 196
al., 2009), prevention of double handling of materials by proper logistic management, promoting reuse 197
of materials, utilization of standard materials in construction, and having separate bins prepared for 198
waste collection for all sub-contractors (Cha et al., 2009, Al-Hajj and Hamani, 2011, Kabirifar and 199
Mojtahedi, 2019), utilization of recovered materials (Domingo et al., 2009), periodic inspections on the 200
use of C&DW containers (Saez et al., 2013), allocation of adequate space for waste sorting (Lu and Yuan, 201
2011, Wang et al., 2014), setting up temporary bins and preventing from mixture of soils (Jingkuang 202
and Yousong, 2011), enough site access for delivery of materials and personnel movement (Nagapan et 203
al., 2012), specific places for cutting and storage of material (Tam, 2008), reuse material scraps (Faniran 204
and Caban, 1998), waste sorting, reusing and recycling (Hassan et al., 2012), and making sub-205
contractors responsible for waste disposal (Domingo et al., 2009). 206
Although the afore-mentioned factors for C&DW management from both hierarchical perspective and 207
influencing factors, have addressed some critical topics related to C&DW management, there is a lack 208
of systematic identification and categorization of these factors in previous researches. Therefore, this 209
study proposes an integrated framework including effective contributing factors to C&DW 210
management and C&DW management hierarchical strategies, in order to effectively manage C&DW 211
concerning all aspects of C&DW management, which is illustrated in Figure2. 212
213
214
Figure2: Relationship between effective C&DW management contributing factors, C&DW management 215
hierarchical strategies and effective C&DW management. 216
In order to achieve the aim of this research which is to critically scrutinize the concept of C&DW and 217
its managerial issues to come up with the effective C&DW management approaches, first, C&DW 218
management hierarchy and its influencing factors should be discussed. Next, effective C&DW 219
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contributing factors should be identified and categorized and in order to effectively manage C&DW, 220
these factors should be incorporated with contributing factors to C&DW management hierarchy. 221
4. Literature Review Methodology 222
A three-stage strategy is selected in order to identify the most relevant research papers namely, 223
database selection, searching and refining the sample. Literature review methodology is presented in 224
Figure3. 225
4.1. Database Selection 226
In order to track academic publications, several database engines can be utilized such as, Scopus, Web 227
of Science, PubMed and Google Scholar. A research conducted by (Falagas et al., 2008) reveals that 228
Scopus database has a preference over other databases, however, in another study performed by (Wang 229
and Waltman, 2016) journal classification of Web of Science is preferred, therefore this study considers 230
both Scopus database and Web of Science database, meanwhile, Google Scholar is also used as an 231
assistant tool. 232
4.2. Sample Searching 233
For this purpose, “effective construction and demolition waste management” as keyword in article 234
titles, abstracts and keywords is searched among articles and review papers from 2009 to December 235
2019 in both Scopus and Web of Science databases. The initial search returns 163 papers. 236
4.3. Sample Selection 237
By the application of abstract reading of 163 papers in the first step and subsequently, by in-depth 238
reading of the whole paper in circumstances in which it is impossible to identify the suitability of 239
papers, the number of 97 papers with the most relevant content is selected. 240
Results of this search indicates that there are 95 articles and 2 review papers. Among these 97 papers, 241
there are 10 open access articles, whereas, other articles are not open access. Among the years, 2019, 242
2018, 2017, and 2015 have the highest publication number within the years with 14, 11, 11, and 11 243
articles, respectively. Meanwhile, with regard to journals, the three highest number of articles are 244
published in Waste Management journal with 16 articles, 12 published articles in Resources, 245
Conservation and Recycling journal, and 11 articles published in the Journal of Cleaner Production. In 246
addition, the top three affiliations are related to Hong Kong Polytechnic University, the University of 247
Hong Kong, and Western Sydney University. Furthermore, Tam, V.W.Y with 4 articles, Yuan, H. with 248
4 articles and Lu, W. with 3 articles were top three authors. To conclude, it should be mentioned that 249
keyword content analysis of these 97 papers leads to two main factors. First, C&DW management 250
hierarchical strategies and their related topics. Second, by classification of factors affecting effective 251
C&DW management, the effective C&DW management contributing factors are also derived. Figure3 252
presents the literature review methodology of this research. 253
254
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255
Figure3: Literature Review Methodology 256
5. Discussions 257
5.1 Construction and Demolition Waste Management Hierarchy 258
Dissimilar views on C&DW management has resulted in contradictory and conflicting waste 259
management philosophies (Lu and Yuan, 2011). Therefore, several efforts have been made to reduce, 260
reuse or recycle C&DW. Each type of waste should be managed based on efficient and proper 261
mechanisms of waste prevention. In order to achieve this goal, a waste management hierarchy should 262
be followed. Based on this hierarchy, generated waste should be recovered based on its appropriateness 263
for being reduced, reused or recycled earlier than the final stage, which is waste disposal into landfills 264
(Ashe et al., 2003, Li and Du, 2015, Pickin et al., 2018, Huang et al., 2018, Jin et al., 2019). 265
Over the last couple of years, several research studies have considered the five key steps in the structure 266
of Waste Management Hierarchy (WMH) (e.g. El Haggar, 2010) including reduce, reuse, recycle (3R’s), 267
treat and disposal, however, waste treatment or recovery option is considered in general waste 268
management category and the last step which is disposal is not considered an efficient waste 269
management option. The C&DW management hierarchy rank strategies regarding priority from 270
avoiding the generation of waste, which is the most preferable outcome, and disposal as the least 271
preferable outcome. 272
Although waste management hierarchy includes 5 steps, the 3R’s principle of waste minimization 273
strategy including reduce, reuse, and recycle are considered as main elements of C&DW management 274
strategies in the academic perspective (Lu and Yuan, 2011, Huang et al., 2018). Traditionally, C&DW 275
management hierarchy including reduce, reuse and recycle seemed to be effective for the purpose of 276
C&DW management research. 277
278
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5.1.1 Reduce 279
Reduction, among the 3Rs C&DW management strategies, is the optimal C&DW management measure 280
because of having the least detrimental effects on our environment. Therefore, reduction strategy is 281
rated as the highest priority in developing C&DW management plans (Huang et al., 2018). It is 282
substantial to reduce the amount of created waste, if created, then it is imperative to identify ways to 283
reuse the materials and finally, if materials cannot be reused then it is important to collect them to 284
recycle and then disposal which is the last step to managing C&DW. Pickin et al. (2018) pointed out 285
some benefits of reducing waste such as, generating income from collecting some materials, reduce 286
costs from purchasing less material, reducing CO2 emissions, reducing cost of transportation of wastes 287
to landfills, etc. It is important to conclude that the best environmental and cost-effective solution is to 288
reduce the amount of waste produced in construction activities by early consideration of using 289
standard sizes and quantities of materials, minimise rework from errors and poor workmanship and 290
plan to reduce off cuts (Osmani et al., 2008, Jaillon et al., 2009, Lu and Yuan, 2013, Bølviken and Koskela, 291
2016, Ding et al., 2016, Llatas and Osmani, 2016). The main barriers in the proper implementation of 292
waste reduction strategy occur when actors in the construction industry are vulnerable to properly 293
communicate and cooperate with each other and stakeholders do not have common understanding 294
among themselves regarding 3Rs C&DW management strategies due to the similarity of reduce, reuse 295
and recycle strategies. Construction actors will take the advantage of all aspects of reduction strategy 296
if reduce strategy is included in the C&DW management cycle for the purpose of waste minimization, 297
therefore, it is vital to pay extra attention to execution of the reduce strategy. Regarding the rapid 298
growth of C&DW generation worldwide, it is crucial to consider high priority in implementation of 299
reduce strategy in the construction industry (Esa et al., 2017a, Esa et al., 2017b). 300
5.1.2 Reuse 301
The action or practice of utilizing pertinent building materials more than once is referred to reusing 302
C&DW, whether these materials are applied in their original purpose or even if they fulfil another 303
function (Huang et al., 2018). Most C&DW can be reused after demolition works. Reduction and reuse 304
are the most effective strategies for the purpose of saving natural resources, environmental protection 305
and saving money. Other benefits of reusing building wastes are to mitigate greenhouse gas emissions, 306
which contribute to global climate change, help maintaining the environment for future generations 307
and to allow products to be used to their fullest extent (Oyenuga, 2016, Park and Tucker, 2017). Various 308
types of building materials can be recovered from construction, renovation and demolition sites and 309
then sold, stored for later use or reused on the current project. However, some certain types of materials 310
from C&D is believed to be toxic and classified as hazardous waste including materials that require 311
special handling care such as latex paint, adhesives, chemical solvents (Oyenuga, 2016). In addition, 312
another affective decision making factor in reusing C&DW is the age of structures involved in 313
demolition projects (Tam, 2011b, Akinade et al., 2015). For instance, old buildings may contain materials 314
that are no longer allowed in new construction such as asbestos. Utilizing skilled workers for collecting 315
and sorting C&DW, assigning incentive for reusing construction and demolition waste, using standard 316
design, materials and construction technology, and finally, develop a market for reused material are 317
effective ways of reusing C&DW (Huang et al., 2018). 318
5.1.3 Recycle 319
The action of breaking down of used items in the construction in order to make new materials is called 320
C&DW recycling, however, immature management of C&DW recycling, inappropriate recycling 321
10
technology, and immature market for recycled products are impediments of C&DW recycling (Huang 322
et al., 2018). C&DW can be recycled onsite or offsite at a C&DW processor, depending on the capacities 323
and facilities of the project. Some certain types of materials can be recycled from building sites including 324
concrete, metal, asphalt, wood, roofing materials, plasterboard and corrugated cardboard. By recycling 325
building materials, finally a huge amount of CO2 is saved, which otherwise would be released by 326
removing waste and supplying natural building materials recurrently over large distances (Oyenuga, 327
2016). There are several benefits to C&DW recycling, and these include mitigating greenhouse gas 328
emission’s production and other pollutants by lessening the demand to pull out new raw materials. 329
Also, it maintains landfill capacity, mitigates demand for new landfills utilization and their associated 330
costs as well as energy saving and the environmental adverse impact reduction (Ashe et al., 2003, Fraser 331
et al., 2011, Li and Du, 2015, Pickin et al., 2018). Furthermore, recycling has a great impact in creating 332
job opportunities and economic activities in related industries. There is a huge market for quality-333
assured recycled building materials. Therefore, recycled building materials have been using in the 334
construction of roads, foundations, and sports grounds, for noise protection walls, and in landscape 335
construction (Fatemi and Imaninasab, 2016), however, to warrant successful waste recycling outcome, 336
government participation is also fundamental (Esa et al., 2017a, Esa et al., 2017b). 337
Based on our research aims, we considered the following topics which are associated with C&DW 338
management hierarchy including; benefits of C&DW reduction and effectiveness measures of waste 339
reduction in C&DW generation, C&DW reduction measures and technologies implementation, policies 340
and strategies adopted in C&DW reduction in design stage, benefits of C&DW reuse, barriers of C&DW 341
reuse, considering C&DW reuse from sustainability perspective, the role of stakeholders in C&DW 342
management, the impacts of C&DW management project phases on C&DW reuse, C&DW recycling 343
motivations, drivers, and barriers, C&DW recycled material quality, quantity and future market, 344
C&DW recycling impacts from sustainability perspective, the impacts of C&DW project life cycle in 345
C&DW recycling, the role of stakeholders in C&DW recycling, C&DW management strategies and etc. 346
(Chini and Nasri, 2009, Yuan and Shen, 2011, Arulrajah et al., 2013, Zhang et al., 2012, Saez et al., 2013, 347
Low et al., 2014, Duan et al., 2015, Lu et al., 2015b, Ding et al., 2016, Oyenuga, 2016, Tam and Lu, 2016, 348
Fatemi and Imaninasab, 2016, Won and Cheng, 2017, Park and Tucker, 2017, Jin et al., 2017, Esa et al., 349
2017a, Esa et al., 2017b, Vitale et al., 2017, Marrero et al., 2017, Yuan, 2017, Li et al., 2018, Gálvez-Martos 350
et al., 2018, Ghisellini et al., 2018, Huang et al., 2018, Yazdanbakhsh, 2018, Menegaki and Damigos, 351
2018, Wang et al., 2019, Osmani and Villoria-Sáez, 2019, Blaisi, 2019). 352
5.2 Effective Construction and Demolition Waste Management Contributing Factors 353
After discussing C&DW management hierarchy including reduce, reuse and recycle strategies, in this 354
step, the effective C&DW management contributing factors are introduced. Based on the identified 355
factors, this study classifies effective contributing factors that affect C&DW management into four 356
groups namely; Regulatory framework for sustainable C&DW management (obligation), C&DW 357
stakeholders’ attitudes (who), C&DW project life cycle (when), and finally C&DW management tools 358
(how). Figure4 illustrates effective contributing factors to C&DW management. 359
11
360
Figure 4: Effective C&DW management contributing factors 361
5.2.1 Construction and Demolition Waste Management from Sustainability Perspective 362
Sustainable development has received a significant value since the early 1980s. In this relation, solid 363
waste in the construction industry has attained extensive consideration around the globe (Lu and Yuan, 364
2011). World Commission on Environment and Development (WCED) has defined sustainable 365
development as development though which basic needs of the public are met and public aspiration for 366
a better life is satisfied without endangering the ability of future generations (Yuan, 2013b, Yuan, 367
2013a). Sustainable development places emphasis on the significance of the co-development of 368
environment, economics and social, which are also acknowledged as a triple bottom line (Li and Pak, 369
2010, Li, 2011, Yuan, 2013b). 370
The phrase environmental impact has become distinguished, particularly with regard to global 371
warming challenges and commitment to green development, provided a definition for environment 372
sustainability as ‘organizations that are sustainable ecologically use natural resources which do not 373
exceed the speed of producing them and control their emission levels to not go over the limit of the 374
ecosystem to absorb and clean up the atmosphere’. Environmental sustainability is the most extensively 375
researched and defined area in the field of sustainability study. It is based on the notion that the Earth’s 376
resources are finite and depreciated natural capital may not be replenished (Formoso et al., 2002, Poon 377
et al., 2004, Shen et al., 2007, Park and Tucker, 2017). Extreme concerns related to possible harmful 378
effects caused by the development of industrial or infrastructural projects or by the release of a material 379
into the environment are increasing (Epstein, 2018). Environmental benefits of managing construction 380
waste include best use of raw materials, cutting down CO2 emissions and reducing waste going to 381
landfills (Mihelcic et al., 2014, Oyenuga, 2016). 382
The construction industry is recognized as a main contributor to environmental pollution and 383
degradation (Shen and Tam, 2002, Lu and Yuan, 2011). For instance, Fédération Internationale du 384
Recyclage (F.I.R) indicated that each ton of waste going to landfill occupies approximately 0.6 m3 space 385
of a land (Qin, 2012, Ding et al., 2016). In addition to water pollution and soil fertility ruination, 386
landfilling also causes vegetable deterioration and nitrate augmentation which affects human health. 387
An experimental research conducted by (Ding et al., 2016, Qin, 2012) revealed that 1000 m2 construction 388
waste going to landfill is equal to losing 1.5 kilotons of groundwater and causes fertility deterioration 389
12
of 52.5 kg of soil each year. In addition, C&DW often comprises oil, fuel and solvents which could 390
penetrate to underground aquifers and causing water pollution (Seror et al., 2014). C&DW also leads 391
to global warming. For instance, by processing each ton of C&DW in a landfill site, 200 lbs. emissions 392
susceptible for global warming is released (Poon et al., 2004, Levis, 2008, Ding et al., 2016). Yuan (2013b) 393
in his research indicated that when waste decomposes in landfill sites over time, a significant amount 394
of methane gas is released into atmosphere. In terms of global warming impact, methane is 21 times 395
more harmful than carbon dioxide (Yuan, 2013b), therefore, working effortlessly to prevent waste, 396
promote reuse and recycling, and develop markets for valuable recycled products have been top 397
priority of waste pioneers in the construction industry (Oyenuga, 2016). 398
In addition to the above-mentioned facts about environmental aspects of C&DW, the phrase economic 399
impact is gaining more interest and attention among all disciplines. This issue is related to the effect 400
that a phenomenon, changes in policy, or market trends have on economic factors (Epstein, 2018). A 401
high rate of construction materials are wasted with an estimation of 20%-30% of total weight of material 402
during construction as mentioned by (Yahya and Boussabaine, 2006, Oko John and Emmanuel Itodo, 403
2013). In parallel, construction waste management has received low attention from waste practitioners 404
and few resources and incentives are assigned to facilitate C&DW management processes (Teo et al., 405
2000, Osmani et al., 2008). At the end of buildings life cycle, a tremendous amount of construction 406
materials are sent to landfills (Wu et al., 2016). Therefore, with the current alarming rate of generated 407
and landfilled waste, the economic impact of C&DW is crucial. 40% of the material flow in the global 408
economy belongs to construction materials (Reza et al., 2011). Moreover, costs of materials contributes 409
to 50%-60% of a construction project’s costs, thus any reduction in waste generation rate leads to major 410
cost savings on projects (Khanh and Kim, 2015). Meanwhile, disposal costs and costs associated with 411
landfilling play a vital role in financial terms (Hao et al., 2008). The economic advantages to be attained 412
from waste minimization are significant. A few studies have considered both direct and indirect 413
impacts of an escalated rate of waste diversion from landfills on the augmentation in the number of 414
jobs and sales of recycled materials (Jain, 2012, Srour et al., 2013, Wu et al., 2014). This can also prevent 415
natural resources from depletion or being diverted from landfill sites (Hao et al., 2008, Hunt and 416
Shields, 2014, Ahankoob et al., 2015). As a consequence of waste generation, projects bear loss of profit 417
due to engagement in additional delays and overhead costs, productivity loss and significant waste 418
disposal costs (Udawatta et al., 2015a, Udawatta et al., 2015b). 419
Social impact is explained as the procedure of analyzing, controlling and managing the social effects 420
from planned and unplanned ways, both negative and positive, of planned involvements (plans, 421
programs, projects, and policies) and any processes of social change applied by those involvements 422
(Yuan, 2012). Regarding C&DW management, the people’s willingness to alter their behaviour and 423
attitudes pertaining to C&DW generation, collection and disposal is addressed to social impact. The 424
commitment and participation of construction stakeholders are considered as important drivers of 425
C&DW management from social perspective (Manowong, 2012, Udawatta et al., 2015a). In addition, 426
social and human capital deals with the matters pertaining to social sustainability. Human capital deals 427
with employees’ skills and loyalty. On the other hand, social capital encompasses the quality of life and 428
cultural components that are innate in each society (Kulatunga et al., 2006). Dyllick and Hockerts (2002) 429
pointed out the complexity of addressing the anticipation of various stakeholders simultaneously, and 430
trade-offs must constantly be made. Thus, (Dyllick and Hockerts, 2002) came up with the following 431
description: “communities gain values through sustainability carried out socially by developing the 432
human resource and advancing the social capital among the people. It is essential to manage social 433
capital so that the stakeholders understand the motivations and accept the organization’s value to the 434
13
system”. Therefore, by proper waste management practices implementation, the construction industry 435
can gain environmental, economic and social benefits. Table2 represents sustainable C&DW 436
management contributing factors. 437
Table2: Sustainable C&DW management contributing factors 438
Sustainable
Construction and
Demolition Waste
Management
Factors
References
1. Environmental
Environmental (water, soil, air, and
noise) pollution and degradation, global
warming challenges, barriers
to green
development, greenhouse gas emission,
fossil fuel emission, resource and raw
materials depletion, i
mpacts of illegal
dumping on neighborhood, etc.
(Shen and Tam, 2002, Formoso et al., 2002,
Poon et al., 2004, Poon, 2007, Shen et al., 2007,
Levis, 2008, Lu and Yuan, 2011, Yuan, 2013b,
Seror et al., 2014, Li and Du, 2015, Oyenuga,
2016, Ding et al., 2016, Park and Tucker, 2017,
Esa et al., 2017a, Esa et al., 2017b, Silva et al.,
2017, Epstein, 2018, Chen et al., 2018)
2. Economic
Cost of materials, energy, waster, labour
and equipment, c
osts associated with
waste transportation, c
osts associated
with disposal, c
osts of valuable lands
filled with C&DW, reuse and recycling
costs, etc.
(Yahya and Boussabaine, 2006, Osmani et al.,
2008, Hao et al., 2008, Lu and Yuan, 2011,
Reza et al., 2011, Jain, 2012, Srour et al., 2013,
Yuan, 2013a, Yuan, 2013b, Dajadian and
Koch, 2014, Ahankoob et al., 2015, Udawatta
et al., 2015a, Udawatta et al., 2015b, Li and
Du, 2015, Wu et al., 2016, Esa et al., 2017a, Esa
et al., 2017b, Silva et al., 2017, Gálvez-Martos
et al., 2018, Chen et al., 2018)
3. Social
Short-term and long-
term health and
safety impacts of C&DW collection,
sorting and disposal, project
stakeholders’ attitude towards C&DW
management, p
ublic view and
awareness alteration towards C&DW
management, t
he role of incentive to
prevent illegal C&DW dumping,
aesthetic impacts of recycling plants and
material stockpiled, etc.
(Teo et al., 2000, Teo and Loosemore, 2001,
Dyllick and Hockerts, 2002, Kulatunga et al.,
2006, Osmani
et al., 2008, Yuan, 2013b,
Udawatta et al., 2015a, Li and Du, 2015, Esa et
al., 2017a, Esa et al., 2017b, Chen et al., 2018)
439
5.2.2 Construction and Demolition Waste Management Regarding Stakeholders’ Attitudes 440
The eminence of human factors in C&DW management has received great attention from researchers 441
(Lu and Yuan, 2011). Initially, all possible ways of waste generation should be identified and 442
consequently immediate proper actions to minimize waste should be carried out by engaged and 443
dedicated stakeholders (Manowong, 2012, Udawatta et al., 2015a) unfortunately, a proper 444
consideration to the elements of waste management has been overlooked by most of the construction 445
stakeholders who concern only about profit (Manowong, 2012). A research carried out by (Osmani et 446
al., 2008) stated that stakeholders engaged in C&DW management have rarely had a clear perception 447
of their roles and responsibilities in mitigating C&DW. For instance, architects as initial designers of 448
building projects, are less involved in strategies of waste minimization because of inadequate level of 449
understanding of the factors that leads to waste generation in the design stage and having false 450
comprehension that liability of waste minimization is contractors’ responsibility and liability. 451
14
Clients play a major role in ensuring waste management and promote communication effectively and 452
support interaction between main contractors and sub-contractors. The client’s role is to establish 453
leadership by securing proper waste consideration, making certain that C&DW reduction is carried out 454
thoroughly by project parties within their roles, communicate on waste requisites with project team 455
and setting rules for material utilization in an efficient manner (Ofori, 2007), however, (Manowong, 456
2012) found out that construction waste management is less important compared to profit 457
maximization from clients’ point of view and clients consider waste management as a factor, which 458
imposes financial burden to project. Because profit maximization is the main objective of many 459
organizations, clients are unwilling to choose efficient C&DW management methods without 460
profitability consideration (Hao et al., 2008). 461
In addition, contractors and sub-contractors play a vital role in elimination or reduction of waste 462
generated by construction activities. One of the strategic approaches towards waste elimination and 463
reduction by contractors and sub-contractors is to estimate required materials of the project and their 464
associated waste accurately and realistically. Main responsibility of contractors is to deliver the 465
requirements of clients by providing and following a waste management plan, which include clear 466
estimation and target of waste that is generated, apparent strategy for waste reduction and a 467
comprehensive strategy to satisfy that generated waste is recycled properly (Tilaye and Van Dijk, 2014). 468
However, site inspection should be carried out on a regular basis and waste management performance 469
should be reviewed periodically in order to point out additional requirements of waste reduction 470
(Udawatta et al., 2015a, Udawatta et al., 2015b, Khanh and Kim, 2015). 471
This approach is further reinforced by other researchers (Esin and Cosgun, 2007, Ghoddousi et al., 2015, 472
Chalker and Loosemore, 2016, Durdyev and Ismail, 2016) who mentioned that waste is generated by 473
involved workforce of a project directly or indirectly, due to low standard workmanship or insufficient 474
training. Training and education of construction workforce as effective ways to minimize waste 475
generation have also been addressed in the work of other researchers (Ding et al., 2016, Llatas and 476
Osmani, 2016). This study categorizes C&DW stakeholders into three groups namely, head-contractors, 477
consultants and sub-contractors. 478
5.2.3 Construction and Demolition Waste Management Regarding Project Life Cycle 479
A research conducted by (Poon et al., 2004) revealed that in order to reduce waste in building projects 480
it is vital that waste management plans be considered by extra attention at the planning phase of project 481
development. A series of measures were suggested by (Dainty and Brooke, 2004) through supply chain 482
management including standardized plans and designs, control of stock, on-time delivery, integrated 483
supply chain, specific sub-contracting packages and prefabrication for the construction industry. 484
Several researchers have focused on the ways through which waste could be reduced during the 485
initiation of a project (planning and design stage) by omitting errors and variations and having detailed 486
specifications (Esin and Cosgun, 2007, Khanh and Kim, 2015, Ding et al., 2016). In addition, (Llatas and 487
Osmani, 2016) considered that waste minimization can be attained via sensible design strategies. 488
However, there are other factors which affect C&DW management in the planning and design stage 489
including; BIM adoption, considering waste estimation in terms of type and volume before project 490
initiation, stakeholder’s engagement, designing waste management plan and to allocate a designated 491
team for monitoring. Other researches have also concentrated on waste minimization strategies in the 492
procurement stage (Levis, 2008, Butera et al., 2015, Akinade et al., 2017, Wang et al., 2019). In addition, 493
in the procurement stage, green procurement, awards and punishment for engaged stakeholders are 494
important factors as well. Moreover, in the construction stage, waste management plan application and 495
15
monitoring, on-site and off-site sorting techniques, collaboration and communication among project 496
teams, awards or punishment for those engaged in C&DW generation and sorting, proper demolition 497
plan, technique and machineries are among the most important factors for C&DW reduction (Poon et 498
al., 2004, Kulatunga et al., 2006, Tam et al., 2007, Wang et al., 2008, Tam, 2008, Arif et al., 2009, Begum 499
et al., 2009, Wang et al., 2010, Tam, 2011b, Tam, 2011a, Yuan, 2012, Poon et al., 2013, Yuan, 2013b, Yuan, 500
2013a). For instance, in a study carried out by (Ajayi et al., 2017), on-site construction waste reduction 501
in the construction phase has been considered. Efficient construction site management is increasingly 502
perceived as the tactical method to achieve the performance required by construction projects. 503
Meanwhile, an important project requirement which has drawn attention of site managers is the 504
comprehensiveness of project sustainability which affect waste output of a project (Udawatta et al., 505
2015a, Ajayi and Oyedele, 2017, Ajayi et al., 2017). The result of study shows that four factors including, 506
waste minimization contractual provisions, waste sorting, maximization of reusing materials and 507
efficient logistic management strategies are among the most significant factors influencing on-site waste 508
minimization. 509
Adequate site space for material storage, equipment, and processed waste have also been addressed in 510
some research (Poon et al., 2004, Wang et al., 2010, Esa et al., 2017b, Ajayi et al., 2017). Availability of 511
local infrastructures for recycling and ease of access to them have a significant impact on results of 512
waste management (Thomas et al., 2002, Dongsheng and Li, 2010). 513
This study categorizes C&DW project life cycle into three groups namely, planning and design phase, 514
procurement phase, and construction and demolition phase. Table3 represents C&DW management 515
concerning the ways to prevent C&DW generation regarding project life cycle. 516
Table3: C&DW management concerning the ways to prevent C&DW generation, and project life cycle. 517
How to prevent C&DW generation?
cycle
Reference
1. Design for dismantling, standardization
while designing, proper collaboration among
stakeholders, estimation of C&DW and C&DW
generation rate before project initiation,
Allocate enough time for auditing, Accurate
and clear design and detailing, Utilization of
high quality products while designing,
Accurate coordination
and communication
among designers, utilization of proper tools,
strategies and software to depict project in a
real manner, etc.
Design phase
(Gavilan and Bernold, 1994, Bossink and
Brouwers, 1996, Ekanayake and Ofori, 2004,
Morgan and Stevenson, 2005, Osmani et al.,
2008, Wang et al., 2008, Arif et al., 2009, El
Haggar, 2010, Al-Hajj and Hamani, 2011,
Kpamma and Adjei-Kumi, 2011, Zhang et
al., 2012, Lehmann and Crocker, 2013, Wang
et al., 2014, Krystofik et al., 2015, Llatas and
Osmani, 2016, Nasiri et al., 2017, Esa et al.,
2017a, Esa et al., 2017b, Gamil and Rahman,
2017, Gálvez-Martos et al., 2018, Ghisellini et
al., 2018)
2. Accurate estimation of materials before
ordering, Proper handling of materials to
construction site, on-site sorting techniques, etc.
phase
(Gavilan and Bernold, 1994, Bossink and
Brouwers, 1996, Lingard et al., 2000,
Formoso et al., 2002, Dainty and Brooke,
2004, Ofori, 2007, Osmani et al., 2008, Saaty,
16
2008, Wang et al., 2010, Lu and Yuan, 2011,
Ann et al., 2013, Li and Yang, 2014, Butera et
al., 2015, Clough et al., 2015, Udawatta et al.,
2015a, Udawatta et al., 2015b, Durdyev and
Ismail, 2016, Lu et al., 2016, Neyestani and
Juanzon, 2016, Oyenuga, 2016, Ajayi and
Oyedele, 2017, Ajayi et al., 2017, Esa et al.,
2017b, Park and Tucker, 2017, Yuan, 2017,
Gamil and Rahman, 2017, Ghisellini et al.,
2018, Bandeira et al., 2019)
3. Precise supervision on construction materials
and works, appropriate storage of material, on-
off materials handling, expert sub-contractor,
adequate communication among stakeholders,
proper utilization of materials, equipment and
machineries, etc.
and
Demolition
phase
(Gavilan and Bernold, 1994, Bossink and
Brouwers, 1996, Faniran and Caban, 1998,
Shen et al., 2004, Hao et al., 2008, Wang et al.,
2010, Ann et al., 2013, Oko John and
Emmanuel Itodo, 2013, Dajadian and Koch,
2014, Gangolells et al., 2014, Marinelli et al.,
2014, Ajayi et al., 2015, Durdyev and Ismail,
2016, Ajayi et al., 2017, Ulubeyli et al., 2017,
Esa et al., 2017b, Bandeira et al., 2019)
It is vital to consider all phases of C&DW project management in order to effectively manage C&DW, 518
because each phase has specific actions to prevent C&DW generation. 519
5.2.4 Construction and Demolition Waste Management Tools 520
Urgent need to mitigate the amount of generated waste drawn attention of many researchers and 521
industry professionals which has led to various research. Therefore, implementation of all contributing 522
C&DW tools have been considered crucial in order to mitigating C&DW. This study categorizes C&DW 523
management tools into three categories, namely information technology tools in C&DW management, 524
C&DW management approaches, and C&DW management technologies (Jin et al., 2019, Wu et al., 525
2019a, Wu et al., 2019b, Wu et al., 2019c). 526
5.2.4.1 Information Technology Tools in Construction and Demolition Waste management 527
5.2.4.1.1 Building Information Modelling 528
One of the most critical aspect of C&DW management is to predict the quantity of waste as it is crucial 529
for C&DW management. For example, the application of Building Information Modelling (BIM) have 530
been considered by some researchers to simulate the design of the buildings before construction 531
(Akinade et al., 2015). It can enable designers to consider material volume at the planning and design 532
phase of a project (Huang et al., 2013, Krystofik et al., 2015). A study conducted by (Cheng and Ma, 533
2013) about the application of building information modelling (BIM) in C&DW estimation and 534
planning reveals that BIM assigns information from multi-disciplinary areas to be applied in a digital 535
building model. In addition, information on material and their quantity can be extracted via BIM 536
17
implementation, which enables participants of the project to improve the technologies and processes in 537
the planning and design phase, procurement phase and construction and demolition phase in order to 538
manage C&DW efficiently (Cheng and Ma, 2013, Hamidi et al., 2014, Wong and Zhou, 2015, Won et al., 539
2016, Won and Cheng, 2017, Xu et al., 2019). 540
5.2.4.1.2 Radio Frequency Identification 541
In Radio Frequency Identification (RFID) radio signals of different frequencies are utilized as a 542
communication technology in order to a specific target identification in real-time without any direct 543
contact or line-of-sight within harsh environment (Sun et al., 2013). RFID has widely been utilized on-544
site to tackle human errors and is precisely integrated with systems of project management in 545
construction projects in order to manage and track construction materials faster and easier (Gulghane 546
and Khandve, 2015). Many technological projects use RFID technology for the purposes of warehouse 547
control, location of materials and people, control of entry and exit of products, vehicles, people, 548
identification of tools, among others. Its main advantages include speed, precision, reliability in data 549
transmission, high degree of control and inspection (Bandeira et al., 2019). 550
5.2.4.1.3 Geographic Information System and Global Positioning System 551
GIS and GPS technologies have also been addressed by some researchers in order to prevent 552
construction waste and evaluate material layout of construction site (Li et al., 2005, Su et al., 2012, Li 553
and Yang, 2014). A research carried out by (Paz et al., 2018) for the purpose of planning a network for 554
C&DW management in Brazil with the assistance of a geographic information system (GIS), reveals 555
that there are three stages in the process including, mapping the illegal waste disposal points of C&D 556
and waste classification based on its recyclability, representing proper areas for small waste generators 557
to voluntary delivery points to be installed and finally, showing proper areas for trans-shipment 558
installation areas and waste sorting regions. In another research carried out by (Madi and Srour, 2019), 559
a GIS-based framework was proposed in order to manage C&DW in emergency situations in Syria. The 560
suggested framework helps in estimating C&DW quantities, automatically allocate proper land for 561
building the recycling facilities and finally, conducting economic assessment of C&DW recycling. In a 562
study conducted by (Blaisi, 2019) in Saudi Arabia dumping trucks have been proposed to be monitored 563
and checked through global positioning system (GPS). Increasing in transporting cost of C&DW and 564
landfill levies have stipulated some dumping trucks to illegal dumping their load. 565
5.2.4.1.4 Big Data 566
Big Data is a magnificent technology for storing and analyzing large volume of data. Its utilization in 567
C&DW data storage and analysis have been emerging since years ago (Bilal et al., 2016). In a research 568
conducted by (Lu et al., 2015a), waste generation rate used as a key performance indicator to benchmark 569
C&DW performance. In this study in order to exploit data, a Big Data set on construction waste 570
management in Hong Kong was applied. In another study conducted in Hong Kong, data extracted 571
from public and private sectors were analyzed using Big Data for the purpose of construction waste 572
management performance assessment (Lu et al., 2016). Other studies (Bilal et al., 2016, Chen and Lu, 573
2017, Lu et al., 2018, Lu, 2019) have also focused on Big Data utilization in C&DW management through 574
storage and processing of large volume of data in the design, procurement, and construction and 575
demolition stages (Bilal et al., 2016, Ram et al., 2019). 576
5.2.4.2 Construction and Demolition Waste Management Approaches 577
18
5.2.4.2.1 Lean Principle 578
Some researchers have recommended that by the application of lean principles almost all sorts of waste 579
can be omitted because the philosophy of lean production is based on refocusing on the proceed of 580
production and value creation via process authenticity (Thomas et al., 2002, Dongsheng and Li, 2010, 581
Ghisellini et al., 2018). 582
5.2.4.2.2 Circular Economy 583
Pearce and Turner introduced a concept in 1990 (Pearce and Turner, 1990), which was later known as 584
circular economy (CE), however, before 1996, this concept had not been used by any country. In 1996, 585
Germany became the first country worldwide that adopted CE and legislate its implementation in its 586
economy by implementing Closed Substance Cycle and Waste Management Act (Su et al., 2013, Esa et 587
al., 2017a). CE was later implemented by Japan, China and Finland. The concept of CE emphasizes on 588
supporting of the maximum efficiency of resource utilization, recycling of materials adoption and 589
energy efficiency, in addition to transforming wastes into resources (Esa et al., 2017a). Actually, reduce, 590
reuse, and recycle are the main elements and concepts that build the basis of CE (Huang et al., 2018). 591
CE aims at promoting compatibility among the ecosystem and economic system by organizing a closed 592
loop of materials for economic activities and fostering cleaner production and industrial ecology 593
(Chiveralls et al., 2012). A research conducted by (Pomponi and Moncaster, 2017), has considered 594
several dimensions for CE research including economic, environmental, technological, societal, 595
governmental and behavioural. 596
5.2.4.2.3 Zero Waste Approach 597
According to (Zaman, 2015), a large number of different waste streams left stakeholders no other 598
alternative except selecting environmentally polluting and inefficient waste management solutions 599
such as landfill. Urban areas lack of landfill sites, which has led authorities to look for alternative waste 600
management systems. Zero waste (ZW), which is a perceptive system of waste management, which has 601
been introduced as an alternative solution for waste problems in recent decades in many cities such as 602
Adelaide, San Francisco, and Vancouver (Connett, 2013, Zaman and Lehmann, 2011, Zaman, 2015). 603
Since, ZW concept motivates sustainable consumption and production, optimization of resource 604
recovery and recycling and prevents wastes from incineration and landfilling, it has also been adopted 605
by policymakers. ZW concept has been applied and perceived by waste management authorities in 606
several ways (Li and Du, 2015). For instance, several studies have asserted to attain zero waste aims 607
with utilizing waste-to-energy technology simultaneously, such as incineration, as waste recovery 608
strategy although zero waste concepts ban incineration and landfills and in general, zero waste concept 609
still needs to be expanded in order to achieve its widely applicability (Abbasi et al., 2012, Premalatha 610
et al., 2013, Björk, 2015). A research conducted by (Zaman and Lehmann, 2011) propose that a ZW city 611
should recover 100% of its resources from waste and should reach 100 % recycling rate. 612
5.2.4.2.4 Green Rating System 613
Green rating systems throughout the world are widely applied in order to assess sustainability of 614
construction processes. Some of these sustainability assessment tools including BREEAM (Building 615
Research Establishment Environmental Assessment Method), LEED (Leadership in Energy and 616
Environmental Design), and Green Star have widely been utilized to foster construction processes in a 617
more environmentally friendly manner. For instance, BREEAM was introduced in 1990 in United 618
19
Kingdom, LEED came to action in 1996 in United States, and Green Star was introduced in Australia in 619
2003 (Esa et al., 2017a, Esa et al., 2017b). 620
5.2.4.2.5 Site Waste Management Plan 621
Site waste management plan (SWMP) is becoming popular nowadays as a valuable approach for the 622
purpose of assisting construction stakeholders to anticipate and officially note the quantity and type of 623
C&DW and take appropriate decisions in order to manage it when necessary. This plan focuses on the 624
construction project’s lifecycle, starting from the planning and designing stage to the demolition stage. 625
SWMP is a legislative requirement for construction activities in many nations (Esa et al., 2017a, Esa et 626
al., 2017b). For instance, in the United Kingdom, Sie Waste Management Plan regulation, which is a 627
legislative framework, requires projects above £300,000 to develop SWMP before construction phase 628
initiation. Another example for this is the introduction of site waste plan in Hong Kong in 2003 for 629
construction industry, although it received negative feedback from some C&DW practitioners, as it was 630
considered to decrease productivity (Tam, 2008). SWMP is also a mandatory requirement for planning 631
approval of some construction projects in Australia (Hardie et al., 2007). Preconstruction strategies as 632
well as statement of details of proposed strategies for waste management during and after construction 633
should be stated in a standard SWMP. The main purposes of creating SWMP is to set waste diversion 634
target, proper waste sorting, collection and auditing, to improve profitability and efficiency of waste 635
management, and ensuring that waste reduction, reuse and recycling are carried out adequately in a 636
proper manner (Ajayi et al., 2015). 637
5.2.4.3 Construction and Demolition Waste Management Technologies 638
Industrialized building system (IBS) and modular construction have also been considered by several 639
researchers (Tam et al., 2007, Jaillon et al., 2009). Capability of prefabrication in reducing construction 640
waste is undeniable. Based on a research conducted by (Tam et al., 2007), an average of 52% waste 641
reduction through prefabrication is achievable, however, prefabrication has some disadvantages 642
including less flexibility with plans and manufacturing and limitation on transportation (Jaillon et al., 643
2009).Therefore, the application of prefabrication or other off-site construction techniques are not used 644
in many construction projects because waste minimization through utilization of these techniques is 645
practically impossible. Although the significance of site management techniques in driving innovative 646
technologies and project performance enhancement is undeniable, most waste management research 647
have focused on applicable new construction techniques and the application of innovative and unique 648
methods in construction (Poon et al., 2004, Jaillon et al., 2009, Lu and Yuan, 2011). The following table 649
indicates C&DW management tools. 650
Table4: Construction and Demolition Waste Minimization Tools 651
C&DW Minimization Tools
Sub-category
References
1. Information Technology
Tools
1. BIM
2. RFID
3. GIS
4. GPS
5. Big Data
(Formoso et al., 2002, Tam, 2008, Kofoworola and Gheewala,
2009, Chini and Nasri, 2009, Dongsheng and Li, 2010,
Nowosielski et al., 2010, del Río Merino et al., 2010, Coelho and
de Brito, 2011, Al-Hajj and Hamani, 2011, Reza et al., 2011,
Saghafi and Teshnizi, 2011, Jain, 2012, Oko John and Emmanuel
Itodo, 2013, Guerrero et al., 2013, Huang et al., 2013, Lehmann
and Crocker, 2013, Premalatha et al., 2013, Marinelli et al., 2014,
Safa et al., 2014, Akinade et al., 2015, Zaman, 2015, Fatemi and
Imaninasab, 2016, Wu et al., 2016, Tam and Lu, 2016, Lu et al.,
2017, Park and Tucker, 2017, Esa et al., 2017a, Esa et al., 2017b)
20
2. C&DW Approaches
1. Lean
Construction
2. Circular
Economy
3. Zero Waste
4. Green Rating
System
5. Site Waste
Management
Plan
(Faniran and Caban, 1998, Teo and Loosemore, 2001, Martin and
Scott, 2003, Kulatunga et al., 2006, Manowong and Perera, 2008,
Osmani et al., 2008, Wang et al., 2008, Walker, 2008, Blengini,
2009, Jaillon et al., 2009, Wang et al., 2010, Lu and Yuan, 2010, del
Río Merino et al., 2010, Coelho and de Brito, 2011, Banias et al.,
2011, Mercante et al., 2012, Yuan, 2013b)
3. C&DW Management
Technologies
1.
Prefabrication
2.
Modularization
(Johnston and Mincks, 1995, Poon et al., 2004, Osmani et al., 2008,
Arif et al., 2009, Begum et al., 2009, Chini and Nasri, 2009, Huang
et al., 2013, Lu and Yuan, 2010, Wang et al., 2010, Li, 2011,
Lachimpadi et al., 2012, Li and Yang, 2014, Low et al., 2014,
Gangolells et al., 2014, Krystofik et al., 2015, Akinade et al., 2015,
Akinade et al., 2017, Esa et al., 2017a, Esa et al., 2017b)
Table4 indicates that C&DW minimization tools has gained attention among researchers in the last 652
years due to providing assessment criteria and measurement tools for C&DW management. 653
6. Conclusions 654
The associated problems with inefficient C&DW management are still persistent and researchers have 655
devoted lots of efforts to tackle these problems. It is necessary to conduct C&DW management 656
effectively in order to preserve our precious resources from devastation and natural habitat from 657
degradation. In order to effectively manage C&DW, two important parameters should be applied 658
together. First, C&DW management hierarchy including reduce, reuse, and recycle strategies and their 659
associated factors should be followed respectively. Second, effective C&DW management contributing 660
factors including C&DW from sustainability perspective, C&DW stakeholders’ attitudes, C&DW 661
project life cycle, and C&DW management tools should be identified and then be incorporated with 662
the first parameter. 663
This research builds a strong and systematic foundation for C&DW management studies by 664
identification and classification of contributing factors in effective C&DW management. Meanwhile, 665
this review in C&DW management, provides in-depth perception of effective management of C&DW, 666
which is utilized as a reference for scholars for their future research in this area as well as assisting 667
C&DW practitioners to improve their performance by considering and focusing on effective C&DW 668
management in order to mitigate C&DW and its detrimental impacts on environment. 669
To conclude, this research summarizes current research disparities within current status of C&DW 670
management body of knowledge by identifying five major gaps, which clarifies the way towards future 671
research in the area of C&DW management. 672
6.1 C&DW management status in developed and developing countries 673
There is a significant difference between developing and developed countries regarding C&DW 674
management. Most of the challenges faced by C&DW practitioners in developed countries including, 675
reducing greenhouse gas emissions, commitment to carbon policy, improving in C&DW recycling tools 676
and technologies, educating and training programs for waste practitioners to alter their attitudes 677
towards better management of C&DW, implementing circular economy, developing more C&DW 678
recycling facilities in urban and rural areas, and to develop market of recycled products and materials, 679
on the other hand, developing countries are steps ahead, however, they also struggle with insufficient 680
21
and imprecise data on C&DW generation, reuse, recycling, and diversion rate from landfills. There are 681
significant practical, economic, cultural and attitudinal differences between developed and developing 682
countries regarding C&DW management. For instance, in developing countries, C&DW management 683
is seen as a government responsibility, however, in developed countries all C&DW practitioners see 684
themselves as stakeholders and shareholders in C&DW management. Therefore, it is recommended 685
that C&DW management needs to be studied and considered within the specific context of a region or 686
country. 687
6.2 Effectiveness of C&DW management 688
This research contributes to identification and classification of effective C&DW management associated 689
factors, however, there should be a measure to assess C&DW effectiveness. Although some researchers 690
have conducted research on the effectiveness assessment of C&DW management by focusing on some 691
indexes such as; waste generation rate, life cycle assessment from sustainability perspective, etc. the 692
effectiveness of C&DW management has not yet been well benchmarked and there is a great need to 693
develop a more comprehensive mechanism to assess C&DW management performance. 694
6.3 Stakeholder attitudes in C&DW management 695
Although C&DW stakeholders have been addressed in many researches, there is still a great need to 696
study how C&DW stakeholders’ attitudes change C&DW diversion rate by utilizing different methods, 697
such as incentives, fines and penalties, training, etc. Meanwhile, despite considering C&DW 698
minimization only through the construction phase, there should be an equal consideration to C&DW 699
management throughout the whole C&DW project life cycle. 700
6.4 C&DW management tools 701
There is a great need to pay extra attention to C&DW management new tools, technologies, techniques 702
and materials. Some forms of C&DW management IT tools, approaches or techniques have been 703
addressed in previous research solely, e.g. prefabrication or circular economy. However, there is a great 704
need to consider as much C&DW management tools as possible in future practical efforts in order to 705
effectively manage C&DW 706
6.5 C&DW hierarchy management 707
In order to effectively manage C&DW, it is mandatory to consider C&DW management hierarchy 708
including reduce, reuse and recycle strategies and effective C&DW management contributing factors, 709
however, there are a lot of overlaps in their context. It is recommended that the effect of each C&DW 710
management hierarchy (reduce, reuse or recycle) on the effectiveness of C&DW management is studied 711
in the future research. 712
This study of effective C&DW management is limited to its recruited journal articles in English 713
language without considering other publications such as conference proceedings, and magazines and 714
other publications in languages other than English, which are considered as limitations of this research. 715
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... On one hand, new constructions require a large amount of concrete raw materials [1]; on the other hand, the amount of construction waste generated from the increasing demolition of old buildings is continually rising, particularly in large cities [2]. Taking the example of approximately 1 billion tons of waste generated annually from new construction, along with the 2 billion tons of waste produced from the demolition and renovation of old buildings, the seriousness of this issue is highlighted [3,4]. The use of recycled aggregate concrete (RAC) is considered to be an effective measure for developing green building materials and achieving sustainable resource development [5]. ...
... The functional models for peak stress dynamic increase factors of PRAC and HTRAC are represented by Eqs. (2 and 3), below are the model equations for different types of concrete: For PRAC: (2) For HTRAC: (3) Here, represents the peak stress under dynamic loading; ...
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Fiber-reinforced recycled aggregate concrete (FRRAC) is renowned for its excellent mechanical properties and environmental benefits, making it a popular choice in construction engineering. However, the impact damage mechanisms of FRRAC remain unclear. This study leverages advanced in-situ 4D CT technology to investigate the fiber-reinforcing mechanisms of High-Toughness Recycled Aggregate Concrete (HTRAC) using construction waste as a sustainable building material. Under high strain-rate conditions, the dynamic mechanical behaviors of both plain recycled aggregate concrete (PRAC) and HTRAC were examined using the Split Hopkinson Pressure Bar (SHPB) method. The experiments revealed significant strain rate sensitivities in both materials, with HTRAC showing superior fiber reinforcement that markedly enhances its toughness. Quantitative models for dynamic increasing factors of key mechanical parameters, including peak stress, peak strain, initial elastic modulus, ultimate strain, and toughness index, were developed. These findings offer critical design insights for using HTRAC in impact load conditions and other extreme environments, promoting its wider adoption in the construction industry .
... The rapid growth of the construction industry has led to a significant accumulation of construction waste. The conventional methods of handling such waste involve either direct dumping or burying it in open areas, resulting in certain environmental degradation [1,2]. Consequently, there is an urgent need for the rejuvenation and utilization of construction waste [3]. ...
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The construction waste powder encompasses waste paste powder (WPP) and waste concrete powder (WCP), exhibiting an irregular microstructural morphology and containing mineral constituents like portlandite, C-S-H gel, calcite and quartz. Under the influence of thermal activation, certain hydrated products within construction waste powder undergo decomposition, concurrently generating new substances like CaO and C 2 S, which contribute to enhanced reactivity. Minerals within construction waste powder participate in polymerization reactions under alkali activation. Furthermore, alkali-activated mortar produced from thermally treated construction waste powder generate an increased quantity of C-AS -H/N-AS -H gel, resulting in a denser microstructure. When construction waste powder is thermally treated at temperatures ranging from 600°C to 800°C, the resulting alkali activated construction waste powder mortar (AAWM) exhibits higher compressive strength. For example, the 28d compressive strength of AAWM prepared with WCP subjected to heat treatment at 800°C increased by 195.69 % compared to AAWM prepared with untreated WCP. With the increase in thermal treatment temperature of construction waste powder, the drying shrinkage of the resultant AAWM progressively diminishes, along with a gradual reduction in porosity and water absorption. For instance, the porosity and water absorption of AAWM prepared with WCP treated at 800°C decreased by 15.58 % and 18.67 % respectively compared to AAWM prepared with untreated WCP. At a thermal treatment temperature of 800°C, AAWM exhibits strong resistance to chloride penetration. Particularly, AAWM containing WPP outperforms that containing WCP in terms of chloride resistance. Consequently, this study reveals that alkali-activated materials prepared using thermally treated waste powder exhibit commendable mechanical and durability properties.
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The construction industry plays a crucial role in the global economy, with significant annual expenses and a substantial contribution to the GDP of the UAE. This has led to a surge in building projects, fostering rapid expansion among construction companies. However, challenges have emerged that hinder this growth, including high interest rates and intensified competition among building firms. Additionally, there are many issues impede project timelines and escalate dedicated costs. Many of these challenges can be addressed by addressing inefficiencies within internal processes of companies. Agile construction, a method or approach that facilitates swift adaptation to changes in delivery or design, has the potential to alleviate these challenges. By reducing the time between problem identification and solution implementation, agile construction can enhance project efficiency. This study aims to propose Critical Influential Factors Model (CIFsM) for Agile Management Principles to enhance the performance of construction projects in the UAE. The proposed model covers five critical influential factor groups: organizational, challenges, human resources, technical, and construction industry project performance in the UAE. The research recommends implementing the model empirically using a quantitative approach to enhance integration among construction parties and alleviate concerns about low project performance levels. Developing the CIFsM based on agile management principles offers a promising avenue to enhance construction project performance in the UAE by addressing critical influential factors and adopting an empirical quantitative approach, leading to improved project integration and reduced concerns about low performance levels.
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While achieving net-zero carbon buildings (NZCBs) offers significant environmental and economic benefits, particularly in developing economies, research on effective strategies and their interplay with carbon credit systems remains limited. This knowledge gap hinders the widespread adoption of sustainable construction practices and the full potential of carbon markets for incentivizing change. This study aims to bridge this gap by investigating and assessing 15 key strategies for achieving NZCBs and promoting carbon credit implementation. Data from 109 construction professionals in Vietnam was analyzed using several statistical techniques. The results of one-way analysis of variance (ANOVA) and Tukey's post-hoc analysis showed no significant differences in the key strategies for promoting carbon credits among key stakeholders (policymakers, contractors, suppliers, and architects/designers). However, distinct variations were identified in the strategies for achieving NZCBs. Furthermore, the findings revealed that the top-priority strategies for NZCBs included: (1) raising awareness, (2) developing project-specific emission reduction roadmaps, and (3) increasing renewable energy utilization. For promoting carbon credits, the prioritized strategies involved: (1) tax reduction, (2) integrating emission reduction criteria into tender documents, and (3) awarding technical points to contractors with emission reduction solutions. Theoretically, this study breaks new ground by simultaneously examining key strategies for achieving NZCBs and carbon credits implementation within the specific context of an emerging economy. Practically, this paper offers valuable recommendations for Vietnamese policymakers and industry leaders, enabling them to navigate a roadmap for a greener and more sustainable built environment, not just in Vietnam but also in other emerging economies facing similar challenges.
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Population growth has driven an increased demand for solid construction materials, leading to higher amounts of construction and demolition waste (C&DW). Efficient strategies to manage this waste include reduction, reuse, and recycling. Technosols—soils engineered from recycled waste—can potentially help with environmental challenges. However, there is a critical need to explore the potential of Technosols constructed with C&DW for land reclamation, through the growth of native vegetation. The objective of this study was to investigate this potential by studying two Brazilian native tree species (Guazuma ulmifolia and Piptadenia gonoacantha). Technosols were created using C&DW, with and without organic compost and a liquid biofertilizer. A soil health index (SHI) was applied to evaluate the soil quality regarding physical, chemical, and biological indicators of Technosols compared to a control soil (Ferralsol). The results showed that P. gonoacantha plants presented the same height and total biomass in all treatments, while G. ulmifolia plants exhibited greater height and total biomass when grown in Technosols. The enhanced plant development in the Technosols was primarily associated with higher cation exchangeable capacity and nutrients concentration in plant tissues. Technosols with added compost provided higher fertility and total organic carbon. Additionally, Technosols presented higher SHI (~0.68) compared to control (~0.38) for both studied species. Our experiment reveals that construction and demolition waste (C&DW) have significant potential to form healthy Technosols capable of supporting the growth of native Brazilian trees. This approach offers a promising alternative for addressing C&DW disposal challenges while serving as a nature-based solution for land reclamation.
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Purpose Construction activities generate overwhelming waste that is typically disposed of in landfills, which has significant environmental consequences and hinders national progress. However, with the appropriate competencies, there is an opportunity to identify construction activities that produce recyclable materials, offering a path to a sustainable future. This study aims to assess the competencies for identifying construction activities that produce recyclable materials. To attain that aim, the study seeks to identify the key competencies and assess the index level of the competencies. Design/methodology/approach A systematic literature review was conducted, and 20 competencies were identified and categorized into knowledge, skills, and abilities. A questionnaire survey was developed based on the competencies and completed by 101 individuals. The collected data were analyzed using normalized mean analysis, confirmatory factor analysis, and fuzzy synthetic evaluation (FSE). Findings The results revealed that the key competencies are problem-solving skills, communication skills, skills in providing vocational training, and knowledge of the environmental impacts of construction activities. The FSE ranks the constructs in order of skills, knowledge, and abilities. Also, the FSE illustrated that the overall index level is inclined to be important. Practical implications This study leads to saving natural resources, using raw materials efficiently, protecting from environmental pollution, and mitigating resource depletion by providing the index level of the competencies. Originality/value The findings can guide professionals in effective waste management, policymakers in creating new policies and regulations, and researchers in compiling a list of competencies for identifying construction activities that produce recyclable materials.
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The article discusses the composition and production technology of mineral powder using waste basalt insulation. This study aims to confirm the hypothesis about the possibility of using basalt waste in the production of mineral powder with technical parameters corresponding to approved standards for the production of asphalt concrete. For definition of qualitative indicators of the received product in comparison with the control sample the researches of the basic indicators of mineral powder according to operating norms are given. Such indicators as grain composition of mineral powder, porosity and density were determined, indicating a more dense structure of the developed composition: the content of particles finer than 0.125 mm – 91.4 %, finer than 0.063 mm – 82.2 % with porosity index 28.1 % and true density 2.49 g/cm3. It was found that the mineral powder from waste basalt mineral slabs has a uniform and balanced grain distribution. At moisture content of samples less than 0.1 % by weight the bitumen capacity index of the tested mineral powder sample in comparison with the control sample showed better value by 2 g, at the same time the degree of swelling of samples from the mixture of powder and bitumen showed better result by 0.1 %. The obtained results indicate that the mineral powder on the basis of waste is able to hold bitumen well on its surface, which contributes to the improvement of adhesion between bitumen and mineral particles. The lower degree of swelling characterizes the increased water resistance and frost resistance of asphalt concrete with the use of this mineral powder. Considering that basalt mineral slabs are waste, their use in the production of mineral powder for asphalt concrete fits into the concept of sustainable construction and can contribute to waste reduction and environmental sustainability of the construction process.
Article
Purpose Reducing construction waste generation and carbon emission in the construction industry is crucial for the “dual carbon” goal. Evaluating the efficiency of reducing construction waste generation and carbon emission in the construction industry at the regional level is an important evaluation basis for the sustainable development of the construction industry. It provides a basis for formulating construction waste and carbon reduction policies tailored to local conditions and comprehensively promote the sustainable development of the construction industry. Design/methodology/approach A three stage SBM-DEA model based on non-expected outputs is proposed by combining the SBM-DEA model with the SFA method. The proposed model is used to evaluate the efficiency of construction waste and carbon reduction in the construction industry in 30 regions of China from 2010 to 2020. Moreover, the study explores the impact of environmental variables such as urbanization level, proportion of construction industry employees, resident consumption level, and technological progress. Findings From 2010 to 2020, the efficiency of construction waste and carbon reduction in China’s construction industry has been increasing year by year. Provinces with higher efficiency of construction waste and carbon reduction in the construction industry are mainly concentrated in the eastern coastal areas, showing an overall pattern of “East>West>Northeast>Middle”. There is a clear correlation between the level of urbanization, the proportion of construction industry employees, residents’ consumption level, technological progress, labor input, machinery input, and capital investment. The construction waste and carbon emission efficiency of the construction industry in various provinces is greatly influenced by environmental factors. Practical implications The research results provide policy makers and business managers with effective policies for reducing construction waste generation and carbon emission in the construction industry, especially circular economy policies. To provide empirical support for further understanding the connotation of construction waste and carbon reduction in the construction industry, to create innovative models for construction waste and carbon reduction, and to promote the multiple benefits of construction waste and carbon reduction in the construction industry, and to provide empirical support for countries and enterprises with similar development backgrounds in China to formulate relevant policies and decision-making. Originality/value The construction industry is a high investment, high energy consumption, and high pollution industry. This study uses the three stage SBM-DEA model to explore the efficiency of construction waste and carbon reduction in the construction industry, providing a new perspective for the evaluation of sustainable development in the construction industry, enriching and improving the theory of sustainable development.
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Construction sustainability performance is indispensable to the attainment of sustainable development. Various techniques and management skills have previously been developed to help improving sustainable performance from implementing construction projects. However, these techniques seem not being effectively implemented due to the fragmentation and poor coordination among various construction participants. There is a lack of consistency and holistic methods to help participants implementing sustainable construction practice at various stages of project realisation. This paper develops a framework of sustainability performance checklist to help understanding the major factors affecting a project sustainability performance across its life cycle. This framework enables all project parties to assess the project sustainability performance in a consistent and holistic way, thus improving the cooperation among all parties to attain satisfactory project sustainability performance.
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The Construction Industry is a complex and fragmented industry worldwide with regards to its supply chain, products, and processes, and is faced with a similar dilemma as faced by manufacturers during its time in past decades. Scope, time, and cost are the triple constraints of project management and leading factors in defining the project performance. Productivity and efficiency of each construction project is measured through its triple constraints, therefore the factors that affect project success are significantly important. Despite the importance of understanding project performance indicators, few empirical studies have been conducted over the last decade in terms of analyzing the factors that determine the performance of high-rise buildings in Engineering, Procurement, and Construction (EPC) projects. Hence, the aim of this paper is to analyze and rank EPC critical activities across large-scale residential construction projects in Iran, by using the TOPSIS method as a multi-attribute group decision-making technique. Results indicate that engineering design, project planning and controls are significant factors contributing to the project performance. In addition, engineering has a pivotal role in project performance and this significance is followed by the construction phase. On the contrary, all believe procurement is more important than Construction phase.
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The recovery of commercial and industrial wastes can lead to reduced emissions, renewable energy production as well as renewable material production. The commercial wastes considered in this study include waste hot-mix asphalt (HMA), commercial food waste, and construction and demolition (C&D) waste. A life-cycle analysis was performed on management alternatives for each of these waste streams. The life-cycle inventory (LCI) models estimate the emissions, energy use, and global warming potential (GWP) associated with each management alternative. Maintenance and rehabilitation of road surfaces leads to the generation of waste HMA. Used HMA is readily recycled as aggregate or new HMA. An LCI model was developed to evaluate three alternatives for the management of waste HMA including, (1) recycling as new aggregate, (2) recycling as new HMA, and (3) disposal in a landfill. The recycling of used asphalt into new HMA results in savings of both petroleum based binders and aggregate, and was shown to be the most favorable alternative. Landfilling of used HMA was shown to have the highest environmental emissions, while recycling used HMA as aggregate was shown to be between the other two alternatives in terms of environmental emissions. Effective management of commercially generated food waste presents an opportunity for avoided global warming potential, renewable energy production, and renewable agrochemical production. The vast majority of food waste is landfilled, but source separated collection of the organic fraction of municipal waste is becoming more common. Currently in the US, food waste that is not buried in a landfill is aerobically composted and the end product has the potential to be used as a soil amendment that can replace mineral fertilizers or other agrochemicals. In Europe, anaerobic digestion (AD) of organic wastes is more common. AD facilities produce methane that can be used as an energy source. The residual from AD can also be used as a soil amendment similar to what is produced at composting facilities. An LCI was performed for food waste processed through several aerobic composting systems, an AD facility, and a landfill with and without energy recovery. The functional unit was one ton of food waste plus 0.6 tons of yard waste. The yard waste was considered because it is used as a bulking agent in food waste composting processes. The AD alternative was superior in every category due to the efficient collection of the methane generated and its conversion to energy. The two landfilling alternatives resulted in the highest GWP although the landfill with energy recovery alternative had the second lowest emissions and energy use. The composting alternatives were superior relative to the landfilling without energy recovery alternative. C&D waste is solid waste generated during the construction, renovation, or demolition of buildings and other structures. A life-cycle model was developed to evaluate two alternatives for the management of C&D waste; (1) recycling (2) and landfill disposal. The C&D waste LCI considered the recovery of ten materials present in a mixed C&D waste stream. All of the materials except for wallboard and miscellaneous materials are recovered for beneficial use. All of the recovered materials except for wood are assumed to replace virgin materials. Wood is assumed to be burned in a co-fired coal plant to produce electricity. The results of this analysis indicate that recovering mixed C&D leads to significant reductions in emissions, energy use, and GWP when compared to landfill disposal of mixed C&D waste.
Article
Significant efforts have been devoted to assessing construction and demolition waste management (CDWM). However, there is little knowledge to understand the utilisation of the developed models for assessing CDWM performance, thus limiting the comparison and generalization of recognized methods and tools. By reviewing the prior published literature, this study assesses the current research methods, in particular, data collection. It also reviews the range of critical indicators for CDWM performance assessment considered by the literature and put forwards a new framework for better assessing CDWM performance. The proposed framework summarises the system boundary, research scale and performance assessment aspects documented by previous studies, and further integrate an integrated framework with procedures for better assessing CDWM performance. The literature review found that while some studies adopt a system thinking and life cycle thinking to assess CDWM performance, other research they adopt a sustainability based model to finalize CDWM performance assessment. The results also demonstrate that compared with environmental and economic aspects, the social aspect has attracted less attention. Social factors, however are crucial in CDWM. The findings about current performance assessment practices in CDWM and the proposed procedures are possible to implement for researchers and practitioners to develop sound CDWM approaches.
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Due to significant environmental, social, and economic impacts, the last decades have witnessed a rapid growth of research related to construction and demolition (C&D) waste. By employing a systematic literature review approach, this study examined C&D waste related articles published since the 1990s in order to explore future research directions. Results show the current C&D waste research has been carried out from various perspectives. These mainly include environmental science and environmental engineering, material science and engineering, industrial ecology, management science, and architecture, engineering, construction and operation of buildings. Consequently, several future research opportunities are identified. These future research opportunities are: (1) identifying pollutants in C&D waste derived from industrial buildings; (2) developing comprehensive pollutant control measures to treat C&D waste; (3) improving the recyclability of C&D waste; (4) developing the advanced performance evaluation criteria for wasted materials and recycled products; (5) extending the research boundary of C&D waste flows; (6) understanding the dynamics and mobility during the life cycle of C&D waste; (7) developing C&D waste disposal charging system; (8) developing advanced methods to assess the C&D waste management performance; (9) exploring the more efficient use of information technologies in C&D waste management; (10) reducing C&D waste from early project stages; and (11) reducing C&D waste during the building operation. These findings are not only valuable to better understand the C&D waste research, but also useful to assist practitioners to further improve C&D waste management performance, and mitigate associated pollution.
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Illegal dumping, referring to the intentional and criminal abandonment of waste in unauthorized areas, has long plagued governments and environmental agencies worldwide. Despite the tremendous resources spent to combat it, the surreptitious nature of illegal dumping indicates the extreme difficulty in its identification. In 2006, the Construction Waste Disposal Charging Scheme (CWDCS) was implemented, regulating that all construction waste must be disposed of at government waste facilities if not otherwise properly reused or recycled. While the CWDCS has significantly improved construction waste management in Hong Kong, it has also triggered illegal dumping problems. Inspired by the success of big data in combating urban crime, this paper aims to identify illegal dumping cases by mining a publicly available data set containing more than 9 million waste disposal records from 2011 to 2017. Using behavioral indicators and up-to-date big data analytics, possible drivers for illegal dumping (e.g., long queuing times) were identified. The analytical results also produced a list of 546 waste hauling trucks suspected of involvement in illegal dumping. This paper contributes to the understanding of illegal dumping behavior and joins the global research community in exploring the value of big data, particularly for combating urban crime. It also presents a three-step big data-enabled urban crime identification methodology comprising ‘Behavior characterization’, ‘Big data analytical model development’, and ‘Model training, calibration, and evaluation’.
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Although construction and demolition (C&D) waste has drawn increasing attention from scholars, there is a lack of study to summarize the latest development of C&D waste research. By using a bibliometric analysis method, this study carries out a holistic review of C&D waste articles published from 1994 to 2017. It shows that the number of C&D waste articles has risen eight-times within the period. This study also demonstrates the social networks among the authors, countries, and organizations. Based on the keywords cluster analysis, the C&D waste research can be divided into five clusters, including (1) environmental concerns of C&D waste; (2) recyclability of C&D waste; (3) performance and behaviour tests of recycled products; (4) C&D waste management; and (5) C&D waste with industrial ecology. Meanwhile, the research status and future directions are discussed as well. The results would be valuable for understanding the streams and trends in C&D waste research.
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A large amount of construction waste is generated every year over the world. Many studies indicated that waste management fee is an effective approach that could minimize the generation of waste and maximize the diversion rate of landfills. However, there are limited number of studies conducted on determining the waste management fee for construction waste. This study proposes a method to optimize the construction waste management fee by considering life-cycle environmental impacts of construction waste and society's willingness to improving the management of construction waste. This contributes to the knowledge body of construction waste management by expand the current models from these aspects. The environmental impacts taxes are selected as the evaluation basis that avoided subjective consequences in previous models. This study provides a series of suggestions for construction waste management sector in China to determining construction waste management fee, based on the findings. It is suggested that the waste management fee for 1 ton of metal waste could be 60.42 yuan (about US$9.30), followed by wood waste 38.47 yuan (about US$5.92) and masonry waste 27.65 yuan (about US$4.25). The average waste management fee for unit comprehensive construction waste of all types of buildings could be 23.61 yuan/ton (about US$3.63/ton). The average waste management fee for unit construction area (1 m²) of all types of buildings is 0.81 yuan/m² (about US$0.12 m²). The proposed method and suggestions could be helpful for waste policy makers as well as researchers for developing construction waste management fee schemes. It worth to mention that these proposed waste management fee would vary over time and regions, as any change of factors in the calculation models would result in a change of the final result. As the application of waste management fee would affect the attitudes and behaviors of stakeholders including the government departments, owners of landfills, collection and transportation parties, waste recycling parties, landfills parties and so on. The determination of waste management fee is a very complex issue and need to be solved via systematic approaches from different perspectives.
Article
In contrast with the prolific research examining the effects of green building (GB) on property value, energy saving, or indoor air quality, there has been minimal focus on GB's effects on Construction Waste Minimization (CWM), which is also an important aspect of cultivating sustainability in the built environment. To address this significant knowledge gap, this study has two progressive objectives: (1) to ascertain the empirical effects of GB on CWM and; (2) to identify and understand the causes leading to the ascertained effects. This is achieved by triangulating quantitative 'big data' obtained from government agencies with qualitative 'thick data' derived from case studies and interviews. The study found that BEAM Plus, the latest version of the Building Environmental Assessment Method developed by the Hong Kong Green Building Council (HKGBC), gave rise to a 36.19% waste reduction by weight for demolition works, but no statistically significant waste reduction for foundation or building works. It is because CWM, the basis for a demolition project to obtain GB credits, makes up only one of many ways for foundation or building works to earn credits, e.g., site aspects, lighting. In any case, CWM measures typically prove costlier means of acquiring credit, further causing developers to pay less attention to CWM in their GB tactics. The study's results, i.e., CWM in GB significantly influences demolition, but only marginally for foundation and building works, provide useful scientific evidence to inform GB councils and other responsible bodies and encourage continuous improvement in GB practices. While the study in general sheds light on how the triangulation of big, empirical data with conventional, qualitative data, e.g., interviews with GB professionals, helps to better understand the subject of the investigation, i.e., the effects of GB on CWM.
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Although investigating project stakeholders' waste reduction intentions and behaviors has gained increasing attention in construction projects, limited efforts have been devoted to understanding behavioral intentions of project managers. Thus, research is needed to identify the motivational factors determining project managers' waste reduction intentions. This study aimed to explore the predictors of project managers' waste reduction intentions through a theoretical model developed based on Ajzen's theory of planned behavior (TPB). Data collected from 199 project managers in China were tested against the TPB model, using the multiple regression analysis approach. The results strongly support the TPB model in predicting project managers' waste reduction intentions. Particularly, attitude was found to be the strongest predictor of project managers' waste reduction intentions, followed by subjective norms and perceived behavioral control. This study advances previous research by developing a model for exploring the predictors of project managers' waste reduction intentions. Understanding the underlying interrelations of those factors influencing project managers' waste reduction intentions can contribute to promoting project managers' waste reduction intentions and willingness in practice.