混凝土模拟液中临界氯离子浓度影响因素分析  

Analysis of some factors affecting chloride threshold level in simulated concrete pore solution

作　　者：张倩倩[1] 孙伟[2] 刘加平[1] 

机构地区：[1]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京211103 [2]东南大学材料科学与工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2010年第A02期177-181,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA030704);国家重点基础研究发展计划(973计划)资助项目(2009CB623200)

摘　　要：采用Ca(OH)2溶液作为混凝土模拟孔溶液,通过动电位极化曲线获取B值来计算腐蚀电流密度进而判断钢筋腐蚀开始的时间,研究了交流阻抗谱和线性极化2种电化学测试方法以及pH对模拟液中引起钢筋锈蚀的临界氯离子浓度的影响规律.研究结果表明:相同条件下线性极化法测得的临界氯离子浓度大于电化学阻抗谱测得的结果;以溶液中氯离子的摩尔浓度表示临界氯离子浓度时,其值随pH值的减小而减小;而以C(Cl-)C/(OH-)表示临界氯离子浓度时,其值随着pH值的减小而增大.Ca（OH）2 solution was used as a kind of simulated concrete pore solution in this paper.The starting point of steel depassivation was determined by corrosion current density which could be calculated when B was obtained by potentiodynamic polarization curves.The effects of electrochemical methods and pH on the chloride threshold level were investigated in the simulated concrete pore solution.The results show that the chloride threshold level for the corrosion of steel reinforcement concluded by linear polarization is higher than that by electrochemical impedance spectroscopy.The chloride threshold level characterized by the chloride ion concentration decreases when pH decreases,while the critical chloride level increases with pH decreasing when characterized by C（Cl-）/C（OH-）.

关 键 词：混凝土模拟孔溶液 临界氯离子浓度 电化学测试方法 PH 

分 类 号：TU528[建筑科学—建筑技术科学]