Self-consolidating concrete using recycled concrete aggregate and high volume of fly ash, and slag

Khodair, Yasser; Bommareddy, Bhagiratha Reddy

doi:10.1016/j.conbuildmat.2017.07.063

Cited by 74 publications

(22 citation statements)

References 5 publications

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“…Rafat Siddique et al [14] found that 53.4%, 39.8%, and 39.1% reduction in the compressive strength of concrete at curing age of 7 days, 28 days and 56 days by partially replacing cement with 50% FA, respectively, at water/binder ratio of 0.44. The compressive strength of HVFA concrete with 50% Class C FA replacement was 22.6%, 21.7% and 18.3% less than that of ordinary concrete, respectively, for 3, 14 and 28 days curing [15]. When the curing period is 28 days, compressive strength of HVFA concrete increased by nearly 20% as the FA content increased from 50% to 70% by mass of total cementitious materials [16].…”

Section: Early Age and Long-term Compressive Strengthmentioning

confidence: 93%

A Review on Early Age and Long-term Compressive Strength of High-volume Fly Ash Concrete

2018

MATEC Web Conf.

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Fly ash is a by-product of the combustion of the coal-fired electric power stations, and disposal of fly ash has been one of the environmental challenges. Much of the studies have been focused on the mechanical property of fly ash concrete. It is no doubt that the use of high-volume fly ash as a partial replacement of cement is also one of the effect way to utilize fly ash. It is known that the compressive strength of fly ash concrete is lower than that of ordinary concrete at early age, especially for high-volume fly ash concrete. It is urgent for engineers to consider the compressive strength of high-volume fly ash concrete at different curing age. In this review, the compressive strength of high-volume fly ash concrete in various literature was reported and then analyzed. Furthermore, the proposal of the utilization of high-volume fly ash concrete is provided.

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Section: Early Age and Long-term Compressive Strengthmentioning

confidence: 93%

A Review on Early Age and Long-term Compressive Strength of High-volume Fly Ash Concrete

2018

MATEC Web Conf.

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“…Differently, the particle grading distribution of the RCA used in this study is continuous in accordance to the distribution of the natural aggregates. With increase of the percentage of the RCA replacement ratio, the porosity of RCA-SCC mixture increases and the high water absorption capacity is raised (Khodair & Bommareddy, 2017). Whilst, the pre-soaked treatment of the RCA compensates the additional consumption of water in concrete mixture compared with the untreated natural coarse aggregates.…”

Section: Fresh State Behaviormentioning

confidence: 99%

“…Results indicated that the existence of polypropylene fibers could attenuate the passing ability but increase the stability of RCA-SCC. Actually, the acceptable properties of SCC would be held even the replacement ratio of RCA was up 50% in SCC (Safiuddin et al, 2011;Khodair & Bommareddy, 2017;Señas et al, 2016). Naturally, using locally available RCA to develop SCC technology is always an encouraged and welcome practice to make SCC much economical and sustainable (Ahmad et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance of Recycled Aggregate Self-Consolidating Concrete Column

Feng

Wang

et al. 2021

Journal of Civil Engineering and Management

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The utilization of recycled concrete aggregate (RCA) can reduce the environmental impact and decreases the cost of concrete. In this study, a comprehensive assessment of self-consolidating concrete (SCC) using RCA as partial or total replacement of coarse aggregate was conducted. Recycled concrete aggregate self-consolidating concrete (RCA-SCC) mixtures with varied water-to-cement (W/C) ratios (0.28–0.46), sand-to-aggregate (S/A) ratios (48–52%), fly ash (FA) contents (20–40%), RCA replacement ratios (0–100%), and water reducer contents (0–1.5%) were designed and tested. 5 groups of the RCA-SCC columns with different W/C and replacement ratios of RCA were also investigated. The slump flow, the J-ring flow and the cubic compressive strength, and the compressive behaviors of the RCA-SCC columns were studied. Results indicated that W/C ratio was the dominant parameter in RCA-SCC mixture, and the failure modes of the RCA-SCC columns were similar to those of the conventional concrete columns. Based on the experimental results, the mechanical performance of RCA-SCC columns was evaluated quantitatively, and a stress–strain relation model for predicting the axial compressive behavior of RCA-SCC column was proposed. This study will provide a reference for the engineering application of the environment-friendly SCC using RCA that are derived from tested or returned concretes with better performance.

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“…The Rapid Chloride Penetration Test (RCPT), which is another such test, provides a diffusion-related conductivity measurement and index, where a higher RCPT value indicates greater concrete diffusion [ 26 ]. Factors that affect the RCPT include the compressive strength [ 26 ]; mineral admixtures such as fly ash [ 27 , 28 , 29 ]; aggregates [ 8 , 30 , 31 , 32 , 33 ]; curing conditions such as autoclaving, steam curing, and normal curing [ 34 ]; pore size [ 26 , 27 ]; RCA replacement ratio [ 35 , 36 , 37 ]; specimen temperature [ 38 , 39 , 40 ]; regional environment conditions [ 26 ]; test conditions [ 40 ]; multiple-stage mixing approaches [ 41 , 42 ]; and sodium silicate and silica fume coating of the RCA aggregate [ 41 , 42 ]. Especially, the RCA coating was observed to fill the cracks and pores using the ITZ of the concrete sample through microstructural analysis [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Drying Shrinkage and Rapid Chloride Penetration Resistance of Recycled Aggregate Concretes Using Cement Paste Dissociation Agent

Yang

Lee

2021

Materials

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In the present study, a recycled concrete aggregate (RCA) coating treatment using a cement paste dissociation agent (CPDA) with different mixing methods was newly incorporated in RCA concrete mixtures. First, a preliminary test program was conducted to determine the proper dosage of the CPDA solution throughout its RCA concrete test results from compressive strength, flexural strength, and elastic modulus. Then, a series of experimental tests were carried out to investigate the effect of RCA coating treatment, different mixing method such as the equivalent mortar volume (EMV) method and conventional method, and different RCA replacement ratios on durability test results of RCA concrete such as drying shrinkage values and rapid chloride penetration test (RCPT) values. The test results showed that all RCA concretes mixed with the coated RCAs were found to be workable regardless of different mix methods, with the slump and air contents of all the mixes being almost identical. All the concrete specimens, which were mixed with the coated RCAs with CPDA solution, represented lower drying shrinkage and RCPT values than those mixed without RCA coating treatment, regardless of different mix proportioning methods or RCA replacement ratios. This holds for the concrete specimens proportioned with the EMV method, regardless of different RCA replacement ratios.

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Self-consolidating concrete using recycled concrete aggregate and high volume of fly ash, and slag

Cited by 74 publications

References 5 publications

A Review on Early Age and Long-term Compressive Strength of High-volume Fly Ash Concrete

A Review on Early Age and Long-term Compressive Strength of High-volume Fly Ash Concrete

Mechanical Performance of Recycled Aggregate Self-Consolidating Concrete Column

Drying Shrinkage and Rapid Chloride Penetration Resistance of Recycled Aggregate Concretes Using Cement Paste Dissociation Agent

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