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WMA is a new technology, which is based on reduced temperature for mixing, and compaction of asphalt mixture, like any pavement material, testing the compatibility of this technology with domestically obtainable material is essential. The objective of the current research is to assist Iraqi establishments in addressing the issues related to resista...
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WMA is a new technology, which is based on reduced temperature for mixing, and
compaction of asphalt mixture, like any pavement material, testing the compatibility of this
technology with domestically obtainable material is essential. The objective of the current
research is to assist Iraqi establishments in addressing the issues related to resi...
Over the time, comparing with the traditional hot mix asphaltic (HMA) mixture, the warm mix asphaltic (WMA) mixture has become extremely widespread in the construction projects of highways because the WMA mixture provides the possibility of manufacturing asphalt mixes at a lower temperature than the traditionally utilized HMA. Thus, it reduces ener...
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Rutting is one of the main distresses of highway asphalt pavement in China. Evaluating the high temperature performance of asphalt pavement during its service period is a major problem for road management departments. The purpose of this paper is to investigate the effect of rutting development levels on the high temperature performance of each lay...
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... One of the related studies proved that the use of additives with WMA changes rutting resistance while the binder source does not influence the resistance to permanent deformation [26] (Figure 2). [14], [26]- [32] there are no old pavements to study the ageing behaviour of warm mix asphalt (WMA) When investigating the rutting resistance of WMA mixes with granite aggregates, it was revealed that the performance of rough graded mixture is better than that of smooth one [33]. This finding can be explained by the fact that the connection between aggregate grains (stone on stone) increases bearing capacity and reduces sensitivity in rutting. ...
Introduction. There has been a world-wide tendency, a global trend to reduce energy demand using a wide variety of methods. With this, on the one hand, the goal is to conserve the limited available and increasingly expensive energy carriers, and on the other hand, it is strived to reduce the emission of greenhouse gases and thereby fight against climate change.
Problem statement. In the field of road construction, the most widespread manifestation of this sustainability endeavour is the goal of replacing high-energy, hot asphalt mixtures (HMA) with variants of suitable quality. It is a common experience that in this field, the so-called warm asphalt mixtures (WMA) can be the most effective solution.
... Although utilising WMA technologies can greatly contribute to ecologically friendly practises, it is uncertain whether they might perform well under heavy traffic conditions over the long term. According to studies, since WMA mixtures are produced at lower production temperatures than HMA, they may be less resistant to rutting because of reduced aging during construction (Bower et al. 2016, Naqibah et al. 2019, Rani 2019, Asmael et al. 2020. ...
The warm mix asphalt (WMA) technology has brought environmental sustainability into the pavement industry with its preparation at lower production temperatures than hot mix asphalt (HMA). Nevertheless, it has also raised concerns regarding the mixture’s resistance to permanent deformation as a result of its reduced aging during production. This study examines the effects of warm mix modification on the rutting potential of bituminous mixes. Two modifiers were used for WMA preparation – polyethylene wax (PEW) and waste cooking oil (WCO). Binder rutting properties were evaluated using the multiple stress creep recovery (MSCR) test. Subsequently, WMA mixtures were prepared at adequate production temperatures, and then their rutting characteristics were evaluated using the Cooper wheel tracker device. The study concluded that introducing warm mix modifiers in small amounts, approximately 1–2% by weight of bitumen, results in rutting characteristics comparable to virgin bituminous mix, whereas the characteristics deteriorate at higher modifier contents. Furthermore, a rutting prediction model based on the Weibull failure rate function (WFRF) was developed. A strong correlation was found between the measured wheel tracking data and the prediction model in all mixtures. PEW was discovered to be a superior warm mix modifier to WCO in terms of rutting resistance.
Over the time, comparing with the traditional hot mix asphaltic (HMA) mixture, the warm mix asphaltic (WMA) mixture has become extremely widespread in the construction projects of highways because the WMA mixture provides the possibility of manufacturing asphalt mixes at a lower temperature than the traditionally utilized HMA. Thus, it reduces energy consumption, decreases CO2 emissions and improves the quality of the environment. The goal of this research was to determine the impact of the Sasobit addition on the sensitivity of mixes to permanent deformation and moisture. Under the framework of this study, four percentages of Sasobit were added are 1.0, 2.0, 3.0, and 4.0 % to investigate the effect of increasing Sasobit content on the moisture and rutting resistance of asphalt mixtures. In summary, the rut of WMA, which was tested in the Hamburg Wheel Tracking Device (HWTD), was decreased as compared to the control HMA, while the rut depth was even lower at 1.0, 2.0, and 3.0 % than that of 4.0 % Sasobit. The moisture resistance was decreased (as compared to conventional HMA) by Sasobit addition, as shown by reducing the tensile strength ratios (TSR), but it was still higher than the minimum of 80%.
Warm mix asphalt (WMA) from different warm mix technologies (WMT’s) can be prepared and compacted at reduced temperatures in comparison to hot mix asphalt (HMA). WMT’s offers unique environmental and economic benefits by reducing the energy consumption, fuel cost, and hauling distance. Numerous laboratory and field investigations have been done to assess the mechanical performance of WMA. The main objective of this state of the art review is to assimilate information on various aspects of WMA mixtures. Data on available WMT’s, mix design of WMA, workability requirements, and performance obtained in the laboratory and field are extensively reviewed and summarized. Effect of various WMT’s on the mechanical performance of asphalt mixtures prepared using polymer modified binder, crumb rubber modified binder, and reclaimed asphalt pavement material is also presented. Additionally, previous works on life cycle cost assessment, greenhouse gas emissions, and economic benefits related to various WMT’s are surveyed.
Utilizing warm mix asphalt (WMA) for pavements attracts attention from around the world due to its benefits. The major benefit is decrease in fuel consumption and emissions. Warm asphalt mixtures are investigated by using organic additives; two additives (Asphaltan A and Asphaltan B) are utilized in this research. A program of laboratory testing is performed on WMA mixtures and hot mix asphalt (HMA) mixtures using two different additives and three contents. Two aggregate gradations were utilized with three values for each additive, and a total of 12 types of warm mixture and two types of HMA were produced. Warm asphalt mixtures were compacted utilizing a Marshall procedure, and optimum asphalt contents were found for each asphalt mixture. A moisture sensitivity test was carried out for all mixture types to find their moisture resistance. From the outcomes, most warm mixtures passed the minimum value of tensile strength ratio (TSR) (80%) as required by the AASHTO and some mixtures failed to meet this criterion, which indicates that the moisture resistance is a concern in warm mixtures. Also, the fracture energy values were higher for warm mixtures than HMA mixtures, which indicates a better resistance to cracking for WMA.
