再生混凝土结构钢筋临界锈蚀率的预测模型  

Prediction model of critical corrosion rate in recycled aggregate concrete structures

作　　者：张喜德[1,2,3] 张椿民 戴中辉[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西工程防灾与结构安全重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2016年第4期945-952,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51408138);广西自然科学基金-青年科学基金项目(2014GXNSFBA118251);广西高校科学技术研究项目(YB2014022)

摘　　要：为预测再生混凝土保护层锈胀开裂时刻的钢筋锈蚀率,根据目前再生混凝土钢筋锈蚀和锈裂行为的试验研究,借助一些合理的基本假定,采用弹性理论分析了钢筋锈蚀至保护层开裂的全过程,建立了再生混凝土结构钢筋临界锈蚀率的理论计算模型,模型中考虑了铁锈在锈胀裂缝中的填充行为和开裂混凝土的损伤。为验证模型的准确性,对15种不同配合比的再生混凝土试件进行了通电加速锈蚀试验。理论分析与试验结果对比表明,模型的预测结果是可靠的,满足工程计算精度,可用于再生混凝土结构钢筋均匀锈蚀条件下的临界锈蚀率计算和耐久性的影响因素分析。To predict the steel corrosion rate when corrosion-induced crackingappears inrecycled aggregate concretecover,basedon experimental studyand some reasonable assumptions,the entirecorrosion process from corrosion initiation to cover cracking due to the corrosion was analyzed by the elastic theory,atheoretical predictionmodel of critical corrosion rate in recycled aggregate concrete structures was established,and the filling behavior of rust in cracks and damagein cracking concrete were considered. In order to verify the model,15 recycled aggregate concrete specimenswere adopted and steel corrosion of the specimens was accelerated with DC power. The comparison between theoreticalanalysis and experimental results shows that the prediction results are reliable and meet the accuracy requirement of engineering. The predictionmodel can be used to analyze the critical corrosion rate and the influence factors of durability of recycled aggregate concrete structures under uniform corrosion.

关 键 词：再生混凝土 临界锈蚀率 预测模型 保护层锈胀开裂 

分 类 号：TU375[建筑科学—结构工程]