固碳强化再生粗骨料对其混凝土力学强度及体积稳定性的影响

doi:10.11896/cldb.24020155

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Abstract In preparing of high-performance recycled concrete, the usage of waste concrete to prepare recycled aggregate and the usage of carbon to prepare carbon sequestration reinforcement recycled coarse aggregate are conducive to the dual environmental protection of “solid waste” and “carbon fixation”. In this work, natural coarse-aggregate concrete (NCA-Concrete), recycled coarse aggregate concrete (RCA-Concrete) and carbon sequestration reinforcement recycled coarse-aggregate concrete (CRCA-Concrete) were prepared, and the influence of carbon-sequestration reinforcement recycled coarse-aggregate (CRCA) on the mechanical strength and volume stability of concrete was investigated. The results showed that carbon sequestration reinforcement reduced the width of the interfacial transition zone (ITZ), elevated the microhardness of ITZ and mortar, and decreased the porosity of CRCA. Comparing to recycled coarse aggregate, CRCA could increases the compressive strength, splitting tensile strength, and flexural strength of concrete (28 d) by 13.52%, 8.49%, and 7.37%, respectively. CRCA could enhance concrete volume stability also, the drying shrinkage of CRCA-Concrete was lower than RCA-Concrete after 12 d and the self-shrinkage of CRCA-Concrete was always lower than NCA-Concrete.

Key words： recycled coarse-aggregate carbon-sequestration reinforcement microstructure mechanical property shrinkage

Published: 10 May 2025 Online: 2025-04-28

CLC number:

TU528

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	Articles by authors
	QIAN Rusheng
	YE Zhibo
	ZHANG Yunsheng
	ZHAO Ruze
	KONG Deyu
	YANG Yang
	NIE Haibo

Cite this article:

QIAN Rusheng,YE Zhibo,ZHANG Yunsheng, et al. Effect of Carbon Sequestration Reinforcement Recycled Coarse Aggregate on the Mechanical Strength of Concrete and Its Volume Stability[J]. Materials Reports, 2025, 39(9): 24020155-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24020155 OR https://www.mater-rep.com/EN/Y2025/V39/I9/24020155

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