Study on Preparation and Properties of Recycled Aggregates Concrete with All Aggregates from Engineering Waste Soil
CUI Peng1, GUO Junjie2, WU Chunran3, YANG Yang4, LUO Fuming3, ZHAO Baojun5, KOU Shicong1,3,*
1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China 2 Shenzhen Shenshan Special Cooperation Zone Shi Ji Kai Heng Technology Co., Ltd., Shenzhen 516400, Guangdong, China 3 School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China 4 Shenzhen Expressway Infrastructure Environmental Co., Ltd., Shenzhen 518057, Guangdong, China 5 China State Construction Hailong Technology Co., Ltd., Shenzhen 518110, Guangdong, China
Abstract: Using modular equipment to separate mud and sand from engineering waste soil, this work produced recycled sand, recycled crushed stone, and engineering waste soil based recycled coarse aggregate, and then prepared recycled aggregates concrete with all aggregates from engineering waste soil (WSRAC). The effects of the replacement rate of engineering waste soil based recycled coarse aggregate on the workability, mechanical property and durability of WSRAC were studied. The results showed that when the 20 mm engineering waste soil based recycled coarse aggregate completely replaces the 10—20 mm recycled crushed stone;the slump of the freshly mixed WSRAC increases from 45 mm to 200 mm, and the 28 day compressive strength decreases from 60.0 MPa to 33.6 MPa, with 56% strength retention. The carbonization depth decreases by 62.5% after 28 days, and the chloride diffusion coefficient decreases by 25% after 90 days. The utilization of engineering waste soil based recycled coarse aggregate and WSRAC not only increases the added value of engineering waste soil, but also significantly improves the workability and durability of WSRAC.
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2026, Vol. 40 
