Research and Application Progress of Mixed Recycled Coarse Aggregate and Its Application in Concrete
MA Kunlin1,*, LIU Jian1, SHEN Jingtao2, HU Mingwen2, WANG Xiaojie2, LONG Guangcheng1, ZENG Xiaohui1
1 School of Civil Engineering, Central South University, Changsha 410075, China 2 China Railway Urban Construction Group Co., Ltd, Changsha 410208, China
Abstract: With the acceleration of Chinese urbanization process and the continuous development of living standards, a large number of brick-concrete buildings constructed from 1960s to 1980s are facing demolition. These brick-concrete structures are crushed and processed into coarse aggregates containing a large number of broken bricks, tiles and low-strength concrete, referred to as mixed recycled coarse aggregate (MRCA). The high-value application of MRCA is a research hotspot for the utilization of construction solid waste. MRCA has the physical properties of high water absorption, high crushing index, high voidage, and low density. Also, it owns a large angularity, surface roughness and fractal dimension, and a small roundness and other particle morphology characteristics. The damage of MRCA concrete is mainly caused by the failure of low-strength broken brick aggregate and the bond failure of the interface transition zone between recycled coarse aggregate and cement mortar. MRCA can be strengthened by physical and chemical methods, and the properties of MRCA concrete can be improved by appropriate mix design methods and preparation techniques. The proportion of recycled brick aggregate is one of the most important parameters affecting the workability, mechanical strength and durability of MRCA concrete. Researchers studied the influence of recycled brick aggregate content on workability, mechanical strength and durability of MRCA concrete. They proposed a damage constitutive model for MRCA concrete based on the stress-strain relationship and recycled brick aggregate content, and analyzed the damage evolution of MRCA concrete. Other researchers tested the mechanical properties and service safety performance of MRCA concrete beams, slabs and columns, and discussed the feasibility of applying MRCA concrete to actual engineering structures. Based on the literature, this paper presents a comprehensive review of the physical and mechanical properties, classification and aggregate reinforcement for MRCA and MRCA concrete in terms of mixture design, workability, mechanical strength, durability, and member performance. Besides, the current problems and application prospects of MRCA research are analyzed, with a view to laying a research foundation for the further use of MRCA.
马昆林, 刘建, 申景涛, 胡明文, 王晓杰, 龙广成, 曾晓辉. 砖混再生粗骨料及其在混凝土中的研究与应用进展[J]. 材料导报, 2023, 37(18): 22010215-12.
MA Kunlin, LIU Jian, SHEN Jingtao, HU Mingwen, WANG Xiaojie, LONG Guangcheng, ZENG Xiaohui. Research and Application Progress of Mixed Recycled Coarse Aggregate and Its Application in Concrete. Materials Reports, 2023, 37(18): 22010215-12.
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2023, Vol. 37 
