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  

Effect of Carbon Sequestration Reinforcement Recycled Coarse Aggregate on the Mechanical Strength of Concrete and Its Volume Stability

作　　者：钱如胜 叶志波 张云升[2,3] 赵儒泽 孔德玉 杨杨[1] 聂海波[4] QIAN Rusheng;YE Zhibo;ZHANG Yunsheng;ZHAO Ruze;KONG Deyu;YANG Yang;NIE Haibo(College of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou 310023,China;Jiangsu Key Laboratory for Construction Materials,Southeast University,Nanjing 211189,China;College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Zhejiang Tianzao Environmental Protection Technology Co.,Ltd.,Lishui 323000,Zhejiang,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023 [2]东南大学材料科学与工程学院,南京211189 [3]兰州理工大学土木工程学院,兰州730050 [4]浙江天造环保科技有限公司,浙江丽水323000

出　　处：《材料导报》2025年第9期93-98,共6页Materials Reports

基　　金：国家自然科学基金青年基金项目(52208292);浙江省自然科学青年基金项目(LQ23E080018);浙江省属高校基本科研业务费-青年英才专项(RF-A2023015)。

摘　　要：采用废弃混凝土制备再生骨料,并对骨料进行固碳强化,制备高性能再生骨料混凝土,有利于“固废”和“固碳”双重环保。本工作制备了天然骨料混凝土(NCA-Concrete)、再生骨料混凝土(RCA-Concrete)和固碳强化再生骨料混凝土(CRCA-Concrete),探究固碳强化再生粗骨料(CRCA)对其混凝土力学强度和体积稳定性的影响及机理。结果表明:固碳强化可减小混凝土中再生骨料的界面过渡区(ITZ)宽度,提高ITZ和砂浆显微硬度,降低CRCA孔隙率;固碳强化再生骨料能提升其混凝土(28 d)抗压强度、劈裂抗拉强度和抗折强度,与RCA-Concrete相比,提升幅度分别为13.52%、8.49%和7.37%;固碳强化再生骨料亦可提升其混凝土体积稳定性,CRCA-Concrete后期(12 d)干燥收缩低于RCA-Concrete,其各龄期自收缩均低于NCA-Concrete。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.

关 键 词：再生粗骨料 固碳强化 微结构 力学性能 收缩 

分 类 号：TU528[建筑科学—建筑技术科学]