Performance of Fully Recycled Aggregate Rockfill Concrete

Abstract

Abstract: As the emission of construction solid waste increases year by year, the traditional treatment methods are facing problems such as resource waste and environmental damage. Self-compacting mortar prepared from recycled fine aggregate and recycled fine powder was utilized to fill the gaps between waste concrete blocks, ultimately creating recycled aggregate rockfill concrete. Research results indicate that the incorporation of recycled powder reduces the slump flow and bleeding rate of self-compacting mortar by 6.1%~16.7% and 7.7%~30.8%, respectively. Replacing cement with recycled powder reduces the 7 d flexural strength of self-compacting mortar and has little effect on 28 and 60 d flexural strength. The replacement of recycled fine aggregate with recycled powder increases the compressive strength of mortar at 7 and 28 d, when the water-cement ratio is 0.45. The compressive strength and splitting tensile strength of rockfill concrete decrease gradually as the curing age increases. Replacing recycled fine aggregate with recycled powder increases the compressive strength and splitting tensile strength of concrete under a low water-cement ratio. The mechanical strength and frost resistance of concrete are affected by water-cement ratio, cementitious material content and aggregate gradation.

Key words: recycled aggregate, self-compacting mortar, rockfill concrete, mechanical property, durability

CLC Number:

TU528

DENG Xin, LI Jun, LU Zhongyuan, LI Xiaoying, HOU Li, JIANG Jun, YOU Ya, ZHANG Junjin, HE Kewen. Performance of Fully Recycled Aggregate Rockfill Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2996-3004.

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