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In this study, silica fume (SF) and fly ash (FA) were added separately as partial replacement of cement from 5% to 20% and from 25% to 40% at 5% intervals, respectively. In case, eight types of self-compacting concrete (SCC) were designed, in comparison with normal concrete (NC). Mechanical properties of NC and various SCC mixtures such as, compres...
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... cement (PC) 42.5, FA and SF were used as cementitious materials. The chemical composition and physical properties of PC, FA and SF are given in Table 1. Natural sand with a fineness modulus of 3.05 and gravel with a nominal maximum size of 20 mm were used as the aggregates for all mixture. ...
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Citations
... Author created suitable blend for SCC, for example, the impact of w/c proportion, silica fume'and lime stone that would fulfil the necessities of the plastic state. It prompts higher than typical modulus esteem and from the blend concentrates on, it is suggested that no more than 6% silica fume'be replaced by mass [2]. In this paper the test results of experimental work shows that the optimal w/c ratio for making SCC in the about of 0.84 to 1.08. ...
Self-compacting concrete has a very important role in the construction of tall structure, because such structures are designed for higher grade concrete as well as higher grade of steel, with less dimensions of structural components. The main execution difficulty of normal concrete was raised due to congestion of reinforced in the structural components, where self-compacting concrete (SCC) is compacted under its own weight without compaction or vibration as well as it has excellent fresh state properties without segregation and bleeding. For present experimental work, first to adopt optimum dosage of superplasticizer is 2.5% and w/c ratio is 0.28 by trial and error method, with accepting fresh properties of SCC results. Later the study is carried by replacement of silica fume with cement 4, 8, 12, and 16% of silica fume by trial and error method. The results obtained by replacement of 12% of silica fume for 7 days compressive strength is 40.1 N/mm² and for 28 days compressive and split tensile strength are 72.6 and 6.9 N/mm², respectively. For a proportion of 2.5% superplasticizer, 0.28 w/c, 12% of silica fume, 506 kg/m³ of cement, 700 kg/m³ of fine aggregates and 833 kg/m³ of coarse aggregates were produced very good compressive strength and split tensile strength, and the trial and error SCC mix design can be adopted for above M70 grade concrete.
... To satisfy the workability criteria 20% slag could be used and for compressive strength 15% slag was found to be optimum percentage [17]. Silica fume was a viable secondary mineral material and suggested that no more than 6% silica be replaced by mass [18]. For SCC mix design, test methodology of fresh state properties was determined by the European Federation of specialist construction of chemicals and concrete systems (EFNARC) guidelines [19,20]. ...
... But the tensile strength of SF 5% was surpassing with other SCC mixes including control SCC also by 4% and 5.3% at 7 and 28 days. Salem [18] also done similar research in SCC using SF and concluded that not more than 6% SF be replaced by mass was suggested is similar to the present investigation on SF with 5%. Ramanathan et al. [1] investigated that beyond 30% addition of powder content (namely, FA, SF &GGBS) resulted in reduction on compressive strength of mix was convincing with the obtained binary blended SCC results using SF, MK & GGBFS respectively. ...
Self compacting concrete (SCC) made a remarkable impact on the concrete construction industry because of its innovative nature. Assessment of optimal ratio between chemical and mineral admixtures plays a vital role in developing SCC. In the present work three different mineral admixtures were used as partial substitute in different proportions to cement to produce SCC with a characteristic compressive strength of 60 MPa. All the three types of SCC were investigated for its fresh and hardened properties. From the results, 50% GGBFS, 10% SF and 20% MK were found to the optimum values as partial substitute to cement.
... Analisando aFig. 2 [8] apresenta valores de E cm , para misturas com 40% de CV aos 28 dias, com aproximadamente 95% do valor correspondente da mistura sem adições. Do mesmo modo, Kuder et al. [9] afirmam que, para idades mais avançadas e valores de f ad mais elevados, o módulo de elasticidade é menos sensível à substituição de cimento por adições do que a resistência à compressão. ...
A necessidade de redução do consumo de cimento, motivada pela crescente preocupação com as
emissões de CO2 associadas ao seu processo de fabrico, tem provocado um aumento significativo da utilização de adições na obtenção de cimentos compostos e na produção do próprio betão. O BAC, devido essencialmente à sua necessidade de incorporar quantidades significativas de material ultrafino (cimento e adições), apresenta um grande potencial para a utilização destes subprodutos, como, por exemplo, cinzas volantes (CV) e fíler calcário (FC), em substituição parcial do cimento. No entanto, o recurso a quantidades significativas de adições, com o consequente aumento do volume de pasta e diminuição do agregado grosso, vai alterar a estrutura dos poros capilares do BAC o que provocará uma mudança na retracção. Sendo a retracção, por secagem, um dos principais factores de deterioração das estruturas de betão, inclusive de BAC, há todo o interesse em discutir o tema.
Desse modo, foi realizada uma campanha experimental para avaliar o efeito na resistência mecânica e na retracção da utilização de quantidades elevadas de CV e FC em misturas binárias e ternárias de BAC. O presente estudo centrou-se essencialmente na avaliação da resistência à compressão uniaxial, do módulo de elasticidade secante e da extensão total de retracção.
Para esse efeito, produziu-se um total de 11 misturas auto-compactáveis: uma só com cimento (C); três com C+CV em 30, 60 e 70% de substituição; três com C+FC em 30, 60 e 70% de substituição; quatro com C+CV+FC em combinações de 10-20, 20-10, 20-40 e 40-20% de substituição, respectivamente.
Self-compacting concrete (SCC) is also seen as unsustainable since it uses a lot of natural resources. Recent researchers have focused on lowering construction costs and partially replacing cement with industrial waste. It is possible to effectively use various industrial wastes in concrete as cement or aggregates. Among these wastes, waste marble (WM) is a useful choice, and researchers have been interested in using WM in concrete for a couple of years. However, to pinpoint the advantages and recent advancements of research on WM as an ingredient of SCC, a comprehensive study is necessary. Therefore, the purpose of this study is to do a compressive evaluation of WM as an SCC ingredient. The review includes a general introduction to SCC and WM, the filling and passing capability of SCC, strength properties of SCC, durability, and microstructure analysis of SCC. According to the findings, WM improved the concrete strength and durability of SCC by up to 20% substitution due to micro-filling and pozzolanic reaction. Finally, the review also identifies research gaps for future investigations.
This research focuses primarily on developing a comprehensive mix proportioning framework for Self-Compacting Concrete (SCC) with Silica Fume (SF). Initially, the mix proportioning of the blended concrete (SCC-SF) is perceived from literature using standard EFNARC guidelines. Using the discerned mix proportioning for SCC-SF, suitable concrete samples were prepared with varying quantities of concrete constituents, mineral admixtures, and different dosages of chemical admixtures, to interpret the fresh and hardened properties of the SCC-SF mixtures. The standard tests for fresh SCC such as L-box test, U-box, V-funnel test, and so on, were carried out for these blended mixtures. Furthermore, the compressive strength test for hardened SCC-SF concrete samples was performed. The experimental results of these fresh and hardened SCC-SF samples are incorporated into a machine learning methodology known as Decision Tree to get further insights on the functional requirements of the SCC-SF mixtures. Additionally, the inherent functional properties of SCC-SF are investigated through a novel mix proportioning methodology termed as Axiomatic Mix Proportioning (AMP) framework, which was developed based on an innovative systems design principle, known as Axiomatic Design. With AMP, the Functional Requirements (FRs) of SCC-SF such as workability, filling ability, passing ability, segregation resistance and compressive strength are investigated concerning its Design Parameters (DPs), i.e. constituents of SCC-SF. Ultimately, with the proposed AMP framework for SCC-SF, a comprehensive nomogram is developed to ease the mix proportioning of SCC-SF. From the nomogram, twenty-two optimal mix proportioning schema were generated. The optimal percentage of mineral admixture (SF), and dosage of chemical admixtures (Superplasticizer-SP, Viscosity Modifying Admixture-VMA, and Air-Entraining Admixture-AEA) to be used in SCC-SF to get maximum compressive strength (52 MPa) are 21.0 kg/m3 (≈ 6 % of cement by weight), 2.3 kg/m3, 0.47 kg/m3, and 1.97 kg/m3, respectively. To validate the nomogram, additional twenty-two sets of SCC-SF samples were prepared, and fresh and hardened concrete tests were carried out. The test results of these additional twenty-two SCC-SF samples and the values of the corresponding sets in the nomogram perfectly correlate, and the percentage of deviations observed was very minimal.
Self-compacting concrete (SCC) is among the high-performance and modern concretes in the concrete industry. The inclusion of chemical and mineral admixtures and other aggregates causes better workability, flow ability, better compressive strength and high resistance to segregation. Silica fume (SF) is a mineral admixture which improves mechanical properties and reduced permeability. Secondly, the super-plasticizer (SP) is a chemical admixture and used for water-reducing, increase cohesiveness, improve passing and filling ability of SCC. However, SF affecting the physical properties of SCC if added in excess quantity in cement. Furthermore, the substitution of SP causes to deliver a negative surface charge on the concrete particles which in turns to result in electrostatic repulsion. Moreover, the higher quantity addition of both SF and SP will badly affect the fresh and hardened properties of SCC. Thus, an ample review was conducted to study the influence of SF and SP on the fresh and hardened properties of SCC. More than 50-previous research articles have been reviewed systematically to argue on the fresh ad hardened properties of SCC. Based on the reviewed literature, the conclusion has been drawn some future recommendations have been achieved related to the title of the research.
This paper focus on analytical and experimental
investigation on the compressive behaviour of confined, selfcompacting
concrete (SCC M40 grade) columns (1050 x 200x200
mm).externally strengthened with steel jacketing techniques. A
total of six numbers of column specimens were tested in this
experimental investigation (4 columns as SCC reinforced sections
and the remaining 2 as conventionally vibrated concrete). Use of
SCC helps to minimize the hearing-related damages on the
worksite that are induced by vibration of Concrete and time
required to place large sections is considerably reduced. The
properties of fresh SCC are confirmed with U- box, V- funnel and
L- box test. The columns were tested under concentric axial
compressive force. The effect of angles and battens on column
strength, ductility and energy absorption capacity could be
obtained from stress strain curves and total displacement curves.
Keywords - ANSYS Software, ductility, energy absorption,
load carrying capacity, Self-compacting concrete
