Effect of Carbon Sequestration Reinforcement Recycled Coarse Aggregate on the Mechanical Strength of Concrete and Its Volume Stability
QIAN Rusheng1,2, YE Zhibo1, ZHANG Yunsheng2,3, ZHAO Ruze1, KONG Deyu1, YANG Yang1,*, NIE Haibo4
1 College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China 2 Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing 211189, China 3 College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 4 Zhejiang Tianzao Environmental Protection Technology Co., Ltd., Lishui 323000, Zhejiang, China
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.
钱如胜, 叶志波, 张云升, 赵儒泽, 孔德玉, 杨杨, 聂海波. 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[J]. 材料导报, 2025, 39(9): 24020155-6.
QIAN Rusheng, YE Zhibo, ZHANG Yunsheng, ZHAO Ruze, KONG Deyu, YANG Yang, NIE Haibo. Effect of Carbon Sequestration Reinforcement Recycled Coarse Aggregate on the Mechanical Strength of Concrete and Its Volume Stability. Materials Reports, 2025, 39(9): 24020155-6.
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2025, Vol. 39 
