水泥基材料中钢筋脱钝临界氯离子浓度的加速测试装置及方法  

Accelerated Test Device and Method for Critical Chloride Content of Steel Depassivation in Cement-based Materials

作　　者：余波[1,2,3] 黄俊铭 卢金马 杨绿峰 YU Bo;HUANG Junming;LU Jinma;YANG Lufeng(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China)

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

出　　处：《材料导报》2023年第3期148-153,共6页Materials Reports

基　　金：国家自然科学基金(52278162,62266005,51738004);广西杰出青年科学基金(2019GXNSFFA245004);广西自然科学基金(2018GXNSFAA281344);广西研究生教育创新计划资助项目(YCSW2021026)。

摘　　要：本工作结合氯离子电迁移系统和电化学测试系统,研发了一种新型的水泥基材料中钢筋脱钝临界氯离子浓度的加速测试装置,分别测试了混凝土和砂浆中钢筋脱钝过程的开路电位、极化电阻和腐蚀电流密度的变化规律,提出了水泥基材料中钢筋脱钝的量化判别方法,并测试了混凝土和砂浆中钢筋脱钝的临界氯离子浓度。分析结果表明,利用所研发的临界氯离子测试装置不仅可以通过电迁移方式加速氯离子在水泥基材料中的传输、缩短试验测试周期,而且能够通过量化判别准则判别试件中钢筋测试端面是否发生脱钝,避免传统测试方法采用钢筋环面作为测试工作面、根据腐蚀电化学参数的特定取值或变化规律定性判断钢筋是否脱钝造成的测试误差。Anew accelerated test device for critical chloride content of steel depassivation in cement-based materials was developed based on chloride migration system and electrochemical test system.Variations of open-circuit potential,polarization resistance and corrosion current density during steel depassivation process in concrete and mortar were tested.Meanwhile,the quantitative discriminant criterion of steel despassivation was proposed.Moreover,the critical chloride contents of steel despassivation in concrete and mortar were tested.Analysis results show that the invented test device and test method for critical chloride content can not only accelerate the chloride transport process in cement-based materials by electromigration to shorten the test time,but also quantitatively determine whether steel despassivation occurs of end test face,avoiding the test error caused by the traditional test method,which qualitatively judges whether the steel despassivation occurs of surrounding test face according to the specific values or variations of corrosion electrochemical parameters.

关 键 词：水泥基材料 钢筋脱钝 临界氯离子浓度 测试装置 量化判别准则 

分 类 号：TU528.01[建筑科学—建筑技术科学]