Effects of recycled aggregate combinations and recycled powder contents on fracture behavior of fully recycled aggregate concrete

Xiao, Jianzhuang; Tang, Yuxiang; Chen, Hongniao; Zhang, Hanghua; Xia, Bing

doi:10.1016/j.jclepro.2022.132895

Cited by 63 publications

(21 citation statements)

References 60 publications

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“…The w/c of RAC-2 and RAC-3 is increased by 33% compared to that of RAC-1, which is the main reason for the decrease in compressive strength. resulting in a lower compressive strength than that of RAC-2 at 28 days [51]. This is contrary to the experimental results shown in Figure 10, where the actual test results show that the compressive strength of RAC-1 is consistently higher than that of RAC-2 within 28 days.…”

Section: Compressive Strengthcontrasting

confidence: 73%

“…Because of the lower w/c, the strength of RAC-1 is supposed to grow faster and should be higher than that of RAC-2 within 3–7 days. Then, because of the low water consumption, the cement of RAC-1 was not fully hydrated, resulting in a lower compressive strength than that of RAC-2 at 28 days [ 51 ]. This is contrary to the experimental results shown in Figure 10 , where the actual test results show that the compressive strength of RAC-1 is consistently higher than that of RAC-2 within 28 days.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

2023

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The water–cement ratio (w/c) has a significant effect on the strength of recycled concrete. In this study, considering the effects of water/cement ratio, strength, and water content of recycled aggregates, two kinds of pulse sequences of low-field nuclear magnetic resonance (LF-NMR) were applied to investigate the water migration behavior between simulated recycled aggregates (SRA) and water or fresh mortar. Three sets of concrete strength tests were designed and the results were used to verify the findings of LF-NMR imaging tests. The results showed that the depth of water migration in the SRA increases with time: at first the change rate is rapid, then slows down, and eventually tends to remain stable. When the SRA is in contact with fresh mortar with low w/c, no water migration occurs because the hydration of the cement in the mixture consumes a large amount of water, resulting in the inability of water to migrate into the SRA through capillary pressure. For the recycled aggregate concrete with high strength, the addition of extra water will increase the effective w/c and reduce the compressive strength of the concrete.

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Section: Compressive Strengthcontrasting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

2023

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“…39 Direct fracture of aggregates was observed by Xiao et al for the concrete specimens with complete replacement of coarse aggregates with recycled aggregates. 40 Reduction in the performance of concrete specimens with the addition of RCA was compensated with the addition of polyethylene fiber. 41…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of recycled aggregate concrete and its variability

Gaurav

Kotoky

Jittin

et al. 2023

Structural Concrete

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The use of recycled aggregate improves waste management and is a crucial step toward the sustainable development of the concrete industry. Hence, this paper presents the experimental investigation to determine the mechanical properties of concrete with recycled concrete aggregates as the selective substitution for natural aggregates. The slump was observed to decrease by replacing natural coarse aggregates with recycled concrete aggregates. Compressive strength of about 40 MPa was achieved after 56 days of curing with the utilization of 100% recycled concrete aggregates. Besides, a reduction in the splitting tensile strength of 14% was observed due to the incorporation of recycled concrete aggregates. The statistical techniques use various probability distribution models such as Gamma, Lognormal, Weibull, and Normal distributions. Amongst the considered functions, lognormal and Weibull distributions best represent the experimentally obtained compressive strength of concrete with 100% natural aggregates and 50% recycled concrete aggregates, respectively. However, for concrete with 100% recycled aggregates, Weibull distribution represent compressive strength after 28 days of curing, and lognormal distribution is given the best fit for the compressive after 56 days of curing. In the case of split tensile strength, lognormal distribution provided the best representation after 56 days of curing for all specimens.

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“…Construction and demolition (C&D) waste pollution and shortage of coarse aggregate have become increasingly serious problems nowadays [1,2]. In this case, the emergence of recycled aggregate concrete (RAC) helps reduce the pollution of C&D waste and contributes to the sustainable development of the construction industry [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Compressive Performance of Fiber Reinforced Recycled Aggregate Concrete by Basalt Fiber Reinforced Polymer-Polyvinyl Chloride Composite Jackets

Zhai¹,

Liu²,

Liu³

et al. 2023

Journal of Renewable Materials

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The development of recycled aggregate concrete (RAC) provides a new approach to limiting the waste of natural resources. In the present study, the mechanical properties and deformability of RACs were improved by adding basalt fibers (BFs) and using external restraints, such as a fiber-reinforced polymer (FRP) jacket or a PVC pipe. Samples were tested under axial compression. The results showed that RAC (50% replacement of aggregate) containing 0.2% BFs had the best mechanical properties. Using either BFs or PVC reinforcement had a slight effect on the loadbearing capacity and mode of failure. With different levels of BFs, the compressive strengths of the specimens reinforced with 1-layer and 3-layer basalt fiber reinforced polymer (BFRP) increased by 6.7%-10.5% and 16.5%-23.7%, respectively, and the ultimate strains increased by 48.5%-80.7% and 97.1%-141.1%, respectively. The peak stress of the 3-layer BFRP-PVC increased by 42.2%, and the ultimate strain improved by 131.3%, relative to the control. This reinforcement combined the high tensile strength of BFRP, which improved the post-peak behavior, and PVC, which enhanced the structural durability. In addition, to investigate the influence of the various constraints on compressive behavior, the stress-strain response was analyzed. Based on the analysis of experimental results, a peak stress-strain model and an amended ultimate stress-strain model were proposed. The models were verified as well; the result showed that the predictions from calculations are generally consistent with the experimental data (error within 10%). The results of this study provide a theoretical basis and reference for future applications of fiber-reinforced recycled concrete. KEYWORDSBasalt fiber reinforced polymer; polyvinyl chloride; recycled aggregate concrete; axial compression performance; stress-strain relationships; stress-strain model Nomenclature f 0 l Lateral confining pressure of actively confined concrete (MPa) f lp Lateral confining pressure of PVC confined concrete (MPa) f lf Lateral confining pressure of BFRP confined concrete (MPa) E pvc Elastic modulus of PVC (MPa) e pvc Mono-axial tensile strain of PVC t pvc Thickness of PVC material (mm) E frp Elastic modulus of FRP (GPa)

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Effects of recycled aggregate combinations and recycled powder contents on fracture behavior of fully recycled aggregate concrete

Cited by 63 publications

References 60 publications

Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

Performance assessment of recycled aggregate concrete and its variability

Compressive Performance of Fiber Reinforced Recycled Aggregate Concrete by Basalt Fiber Reinforced Polymer-Polyvinyl Chloride Composite Jackets

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