Investigation of mechanical properties of concrete with natural aggregates partially replaced by recycled coarse aggregate (RCA)

Shah, Mahesh Chandra; Gupta, Karan Kumar; Nainwal, Ankit; Kumar, Vivek

doi:10.1016/j.matpr.2020.12.456

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…M. C. Shah used RCA instead of NCA to prepare recycled concrete with a gradient of 7%, 14%, 21%, and 28% and studied the mechanical properties of recycled concrete. It was found that the mechanical properties of recycled concrete could still meet the design requirements [19]. Ruaa Yousif Hassan used RCA to replace NCA at 100%, and RFA to replace RS with 25%, 50%, 75%, and 100% replacement rates to prepare recycled self-compacting concrete with different mix ratios and study its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Study of the Properties of Full Component Recycled Dry-Mixed Masonry Mortar and Concrete Prepared from Construction Solid Waste

Kong²,

Cai

et al. 2021

Sustainability

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Solutions are needed to solve the problem of a large amount of construction solid waste and a shortage of natural aggregate (coarse and fine aggregates). In this paper, simple-crushed coarse aggregate (SCRCA) and simple-crushed fine aggregate (SCRFA) were obtained by simple-crushing of construction solid waste. On this basis, SCRCA and SCRFA were treated with particle-shaping to obtain particle-shaping coarse aggregate (PSRCA) and particle-shaping fine aggregate (PSRFA), and the recycled powder (RP) produced in the process of particle-shaping was collected. Under the condition of a 1:4 cement-sand ratio, RP was used to replace cement with four substitution rates of 0, 10%, 20%, and 30%, and dry-mixed masonry mortar was prepared with 100% SCRFA, PSRFA, and river sand (RS). The basic and mechanical properties and microstructure of hydration products of dry-mixed mortar were analyzed, and the maximum substitution rate of RP was determined. Under the condition that the amount of cementitious material is 400 kg/m3 and the RP is at the maximum replacement rate, three different aggregate combinations to prepare concrete are the 100% use of SCRCA and SCRFA, PSRCA and PSRFA, and RS and natural aggregate (NCA); the workability, mechanical properties, and aggregate interface transition zone of the prepared concrete were analyzed. The results show that when the replacement rate of RP is less than 20%, it has little effect on the properties of products. The performance of PSRCA and PSRFA after treatment is better than that of SCRCA and SCRFA. Under different RP substitution rates, the performance of dry-mixed mortar prepared with PSRFA is very close to that prepared with RS. The performance of recycled concrete prepared with PSRCA and PSRFA is also very close to that of products prepared with NCA and RS. The failure morphology of PSRCA and RSRFA concrete is also similar to that of NCA and RS concrete.

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Section: Introductionmentioning

confidence: 99%

Study of the Properties of Full Component Recycled Dry-Mixed Masonry Mortar and Concrete Prepared from Construction Solid Waste

Kong²,

Cai

et al. 2021

Sustainability

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“…[2][3][4] As a result, the workability, mechanical properties, and durability of recycled aggregate concrete (RAC) are inferior to the natural aggregate concrete (NAC). [5][6][7][8][9][10][11][12][13] From mesoscopic view, at the same mix proportion, RAC will contain more types and numbers of interfacial transition zone (ITZ) than ordinary concrete. 14 Previous studies have also confirmed that the ITZ is always the weakest point in the concrete 15 ; therefore, compared with NAC under the same mixtures, RAC has more defects.…”

Section: Introductionmentioning

confidence: 99%

Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying

Gong

Zhi

et al. 2021

Structural Concrete

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The fundamental reason for the poor performance of recycled aggregate (RA) and recycled aggregate concrete (RAC) is the attached mortar, which severely restricts the application of RA and RAC. This research proposes an innovative method for the modification of RA: using the freeze–thaw cycle (FTC) to remove the attached mortar. In addition, to improve the spalling efficiency, high temperature drying is introduced before and during FTCs. The results show that as the lowest temperature of FTC decreases, the spalling rate increases. Besides, the attached mortar that suffered from high temperature drying is more likely to be peeled off during the following FTCs, and more times of high temperature drying treatments can provide higher efficiency. At the same time, vibrating process can introduce mechanical damage, which is also beneficial for the removal of mortar. Finally, after proper combination of FTC, high temperature drying and vibrating, all attached mortar can be peeled off quickly, and the physical/mechanical properties of modified RA can be very close to the natural aggregates.

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Mesoscale discrete analysis of mechanical properties of recycled aggregate concrete based on Voronoi mesh

Gong

Liu

Zhao

et al. 2023

Construction and Building Materials

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Investigation of mechanical properties of concrete with natural aggregates partially replaced by recycled coarse aggregate (RCA)

Cited by 9 publications

References 6 publications

Study of the Properties of Full Component Recycled Dry-Mixed Masonry Mortar and Concrete Prepared from Construction Solid Waste

Study of the Properties of Full Component Recycled Dry-Mixed Masonry Mortar and Concrete Prepared from Construction Solid Waste

Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying

Mesoscale discrete analysis of mechanical properties of recycled aggregate concrete based on Voronoi mesh

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