水灰比对水工混凝土中钢筋锈蚀的影响  

Influence of ratio of water to cement on corrosion of steel bar in hydraulic concrete

作　　者：施惠生[1,2] 郭晓潞[2] 张贺[2] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092 [2]同济大学环境材料研究所,上海200092

出　　处：《水利学报》2009年第12期1500-1505,共6页Journal of Hydraulic Engineering

基　　金：国家973项目(2001CB610704);上海市科委应用技术开发项目(HT0106024A101)

摘　　要：通过电化学试验方法,探讨了非开裂状态下混凝土水灰比对混凝土中钢筋锈蚀的影响规律,以研究钢筋锈蚀破坏引起的水工混凝土结构失稳破坏。研究表明,降低水灰比,可以延长钢筋开始锈蚀的时间;进入稳定锈蚀阶段后,水灰比越小,稳定腐蚀电流密度就越小,水灰比与稳定腐蚀电流密度存在一定的函数关系,且数据相关性良好;降低水灰比能有效改善混凝土-钢筋界面区的微观结构,降低了界面区的氧气含量,同时也减少了界面区的毛细孔水及层间水含量,氧气和水含量的减少降低了钢筋锈蚀速率。To study the destruction of hydraulic concrete structure resulting from the corrosion of steel bar,the influence of ratio of water to cement (W/C) on corrosion of steel bar in concrete without cracks were carried out using electrochemical tests. The results showed that the corrosion of steel bar was delayed at low W/C. It also showed that at stable corrosion time,the W/C had a well function relationship with stable corrosion current density. Further studies showed that with low W/C,concrete microstructure w...

关 键 词：水灰比 水工混凝土 钢筋锈蚀 稳定腐蚀电流密度 

分 类 号：TV33[水利工程—水工结构工程]