Study on the Effect of Recycled Coarse Aggregate on the Shrinkage Performance of Green Recycled Concrete

Yang Yu, Peihan Wang, Zexin Yu, Gongbing Yue, Liang Wang, Yuanxin Guo and Qiuyi Li
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Yang Yu: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China
Peihan Wang: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China
Zexin Yu: College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Gongbing Yue: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China
Liang Wang: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China
Yuanxin Guo: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China
Qiuyi Li: College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China

Sustainability, 2021, vol. 13, issue 23, 1-15

Abstract: Shrinkage property is a significant indicator of the durability of concrete, and the shrinkage of green recycled concrete is particularly problematic. In this paper, construction waste was crushed and screened to generate simple-crushed recycled coarse aggregate (SCRCA). The SCRCA was then subjected to particle shaping to create primary particle-shaped recycled coarse aggregate (PPRCA). On this basis, the PPRCA was particle-shaped again to obtain the secondary particle-shaped recycled coarse aggregate (SPRCA). Under conditions where the dosage of cementitious material is 300 kg/m 3 and the sand rate is 38%, a new high-belite sulphoaluminate cement (HBSAC) with low carbon emission and superior efficiency was used as the basic cementitious material. Taking the quality of recycled coarse aggregate (SCRCA, PPRCA, and SPRCA) and the replacement ratio (25%, 50%, 75%, and 100%) as the influencing factors to prepare the green recycled concrete, the workability and shrinkage property of the prepared concrete were analyzed. The results show that the water consumption of green recycled concrete decreases as the quality of the recycled coarse aggregate (RCA) increases and the replacement ratio decreases, provided that the green recycled concrete achieves the same workability. With the improvement of RCA quality and the decrease of replacement ratio, the shrinkage of recycled concrete decreases. The shrinkage performance of green recycled concrete configured with the SPRCA completely replacing the natural coarse aggregate (NCA) is basically the same as that of the natural aggregate concrete (NAC).

Keywords: green recycled concrete; recycled coarse aggregate; water consumption; shrinkage property; SEM analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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