再生混凝土单轴受压疲劳性能  

Investigation on the fatigue behavior of recycled aggregate concrete under uniaxial compression

作　　者：肖建庄[1,2] 李宏[1,3] 

机构地区：[1]同济大学,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092 [3]浙江省建筑设计研究院,浙江杭州310006

出　　处：《土木工程学报》2013年第2期62-69,共8页China Civil Engineering Journal

基　　金：教育部新世纪优秀人才支持计划(NCET-06-0383);国家自然科学基金(51178340)

摘　　要：完成再生粗骨料取代率为100%的再生混凝土单轴受压疲劳试验,着重考察在疲劳荷载作用下的应变响应和疲劳损伤累积。基于文献中普通混凝土受压疲劳性能研究成果,对比分析再生混凝土与普通混凝土的疲劳性能差异,发现再生粗骨料附着老砂浆、再生混凝土中多界面等特点没有引起两种混凝土疲劳性能的显著区别。进一步研究残余应变和疲劳应变的变化情况,并对再生混凝土的疲劳模量与裂纹的扩展进行分析,建立疲劳失效过程与应变响应行为之间的关系,揭示再生混凝土的疲劳损伤演化过程。基于试验结果和连续损伤力学,提出一个再生混凝土损伤模型,可用来对再生混凝土疲劳性能进行理论和数值分析。The fatigue behavior of recycled aggregate concrete （RAC） with 100% recycled coarse aggregate （RCA） replacement percentage under uniaxial compression loading was tested. Special attentions were devoted to the strain response and damage accumulation of RAC under fatigue loading. The fatigue behavior of RAC was compared with that of natural aggregate concrete （NAC） in literature. It is found that the old mortar attached to the RCAs, more interfacial transition zones （ITZs） et al. in the RAC have no obvious influence on the fatigue behavior of RAC under uniaxial compression. Based on the analysis of residual strain accumulation, fatigue strain variation, fatigue modulus as well as microcracks propagation, the relationship between the fatigue failure process and the strain response was put forward, and the fatigue damage evolution of RAC was studied. On the basis of the experimental results and continuum damage mechanics, a damage model was proposed for the theoretical and numerical analysis of RAC fatigue behavior.

关 键 词：再生混凝土 单轴受压 疲劳性能 损伤分析 

分 类 号：TU528[建筑科学—建筑技术科学]