再生骨料取代率对再生混凝土耐久性的影响  

Effects of Recycled Aggregate Substitution Rate on the Durability of Recycled Concrete

作　　者：何燕 彭磊[2] 高辉[3] 水亮亮 He Yan;Peng Lei;Gao Hui;Shui Liangliang(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,215011;Shaanxi Provincial High performance concrete Engineering Laboratory,Shaanxi Railway Engineering Vocational and Technical College,Weinan 714099;Tianjin Institute of Architectural Sciences,Tianjin 300193;Shanghai municipal engineering design and research institute co.,Ltd,Shanghai 200092)

机构地区：[1]苏州科技大学土木工程学院,苏州215011 [2]陕西铁路工程职业技术学院陕西省高性能混凝土工程实验室,渭南714099 [3]天津市建筑科学研究院,天津300193 [4]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《粉煤灰综合利用》2018年第4期28-30,34,共4页Fly Ash Comprehensive Utilization

基　　金：陕西省高性能混凝土工程实验室开放基金项目(SHPC201701);硅酸盐建筑材料国家重点实验室开放基金项目(SYSJJ2018-09)

摘　　要：再生骨料本身的随机性和变异性,使得再生混凝土微观结构和性能比普通混凝土更复杂。本研究系统研究了再生骨料替代率对再生混凝土抗碳化性能,收缩徐变以及耐高温性能的影响。结果表明,随着再生骨料替代率增加,再生混凝土的碳化深度增加,干缩变形增大。而随着温度增加,再生骨料替代率在50%以上时,再生混凝土经500~800℃高温后的抗压强度残余率显著提高。本研究揭示了再生混凝土结构与性能协同作用机制,为再生混凝土性能调控优化提供了理论指导与方法。Due to the randomness and variability of recycled aggregates, the microstructure as well as the performance of the recycled concrete is more complex than that of the ordinary concrete. In this research, effects of recycled aggregate substitution rate on the durability of recycled concrete were systematically analyzed, in terms of carbonization resistance, shrinkage, creep, and resistance to elevated temperatures. The results show that when the substitution rate of recycled aggregates increases, the carbonation depth and the shrinkage of the recycled concrete increase significantly. However, in terms of the resistance to elevated temperature, when the substitution ratio of recycled aggregates increases to more than 50 %, the compressive strength of the recycled concrete increases remarkably. The synergy mechanisms of the microstructure and the performance were thoroughly analyzed, in terms of the durability of the recycled concrete, which provides solid theoretical basis for the optimization and regulation of the performance of recycled concrete.

关 键 词：再生混凝土 抗碳化 收缩徐变 抗高温性 

分 类 号：TU528[建筑科学—建筑技术科学]