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/m3 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).
Highlights
With the rapid development of the economy and the rise of infrastructure construction, problems related to natural resource shortages and the disposal of construction waste are becoming more and more serious
This study focuses on the effect law of recycled coarse aggregate (RCA) on the shrinkage properties of green recycled concrete
Recycled aggregate concrete made by KLRCA is abbreviated as KL-recycled aggregate concrete (RAC)
Summary
With the rapid development of the economy and the rise of infrastructure construction, problems related to natural resource shortages and the disposal of construction waste are becoming more and more serious. The construction industry is recognized to be the main contributor to environmental degradation due to all stages of its process requiring the consumption of natural resources and the production of construction waste [1,2,3]. Many studies have proved that construction waste can be used as raw materials for preparing recycled coarse aggregate (RCA), which can replace natural coarse aggregate (NCA) [8,9,10]. It is worth noting that the performance of green recycled concrete prepared by RCA is usually far inferior to that of natural aggregate concrete (NAC) [11,12,13]. Some researchers have investigated the influencing factors and Sustainability 2021, 13, 13200.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
