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| Dynamic control effect of chloride in concrete based on multi-level electromigration |
Xin SONG1,2( ),Wei-jie FAN2,*(),Jiang-hong MAO2,Wei-liang JIN1,2 |
1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Engineering and Architecture, NingboTech University, Ningbo 315100, China |
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Abstract An embedded carbon fiber net was used as the built-in electrode to carry out the electromigration repair of the concrete specimen in the chloride environment and eliminate the chloride ions near the reinforcement and in the concrete cover. The characteristic test of iodine ion migration was used to reflect the process of ion migration, and to evaluate the relay function of multi-level migration to ion migration. The concentration and spatial distribution of residual chloride ions in the repaired samples were quantitatively studied by setting different layers of built-in electrodes. The long-life protection strategy of concrete structures based on multi-level electrical migration was discussed combined with the investigation data of chloride concentration of existed structures. Experimental results show that the control effect of chloride of multi-level electromigration is more significant than that of direct electromigration. The chlorine removal efficiency of three-level electromigration is 1.20 times and 2.26 times of two-level electromigration and single-level electromigration, respectively.
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Received: 05 February 2020
Published: 25 April 2021
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| Fund: 国家自然科学基金资助项目（51638013，51878610，51820105012），浙江省自然科学基金资助项目（LY18E080003，LQ19E080011，LQ19E080012） |
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Corresponding Authors:
Wei-jie FAN
E-mail: 21712181@zju.edu.cn;fanwj@nit.zju.edu.cn
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基于多级电迁的混凝土内氯离子动态控制效果
为了高效排除钢筋附近与保护层内的氯离子，预埋碳纤维网作为内置电极对氯盐环境下的混凝土试件进行多级电迁的试验，研究其除氯效果. 利用碘离子迁移特征试验对离子迁移过程作直观效果反映，评价多级电迁对离子的迁移功能. 通过设置不同层数内置电极，定量研究电迁后试件内残余氯离子质量分数与空间分布. 结合既有结构氯离子质量分数调研数据，讨论基于多级电迁的混凝土结构长寿命防护策略. 结果表明：多级电迁对氯离子控制效果更显著，三级电迁作用下保护层除氯效果分别是两级电迁和单级电迁的1.20倍与2.26倍.
关键词：
混凝土耐久性,
电化学修复,
多级电迁,
氯离子,
均匀性
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