用交流阻抗法研究电化学脱盐对钢筋混凝土的影响  

Property Studied by AC Impdance Sectrum Method for Electrochemical Chloride Extacted Reinforced Concrete

作　　者：丁铸[1] 黄燕[2] 徐建芝[1] 邢锋[1] 

机构地区：[1]深圳大学土木工程学院,深圳市土木工程耐久性重点实验室,深圳518060 [2]广东省理工职业技术学校,广州510500

出　　处：《中国包装科技博览（混凝土技术）》2010年第10期23-26,共4页China Science and Technology Review

基　　金：国家杰出青年科学基金（50925829）;深圳大学科技创新团队项目（T200901）

摘　　要：使用交流阻抗谱方法对电化学脱盐后钢筋混凝土性能进行研究，分别比较了不同脱盐时间下钢筋混凝土试件的钢筋钝化膜电阻、极化电阻、混凝土扩散阻抗系数等电化学信息，对电化学脱盐方法做出了评价。研究表明，电化学脱盐方法增大了混凝土中钢筋的钝化膜电阻，对钢筋产生了再钝化作用；同时增大了钢筋表面的极化电阻，降低了钢筋腐蚀速率。随着电化学脱盐时间的延长，混凝土的扩散阻抗系数持续增加，有效降低了钢筋二次腐蚀的危险性。AC ipedance sectrum method was used to study the property of concrete samples which were treated by electrochemical chloride extaction. Both the passivation membrane resist resistance and polarization resistance of steel bar, diffusion impedance coefficient of concrete and other electrochemical parameters of concrete were compared respectively, these concrete samples were treated by electrochemical chloride extaction within different time. The results show that, electrochemical chloride extaction can increase the passivation membrane resist resistance, which leads to the repassivation of steel bar in concrete. Electrochemical chloride extaction also increases the polarization resistance of steel bar, which can reduce the corrosion rate of steel bar. With the prolongation of electrochemical chloride extaction, diffusion impedance coefficient of concrete continues to increase, which effectively decreases the danger of steel bar suffering the secondary corrossion.

关 键 词：交流阻抗法 电化学脱盐 钢筋混凝土 钢筋锈蚀 耐久性 

分 类 号：TU375[建筑科学—结构工程]