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

被引：0
|
作者：
Yu B. [1 ,2 ,3 ]
Huang J. [1 ]
Lu J. [1 ]
Yang L. [1 ,2 ,3 ]
机构：
[1] School of Civil Engineering and Architecture, Guangxi University, Nanning
[2] Key Laboratory of Engineering Disaster Prevention and Structural Safety, Ministry of Education, Nanning
[3] Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Nanning
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 03期
基金：
中国国家自然科学基金;
关键词：
cement-based material; critical chloride content; quantitative discriminant criterion; steel despassivation; test device;
D O I：
10.11896/cldb.21030054
中图分类号：
学科分类号：
摘要：
A new 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. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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