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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (3): 511-518    DOI: 10.3785/j.issn.1008-973X.2021.03.011
土木与交通工程     
基于多级电迁的混凝土内氯离子动态控制效果
宋鑫1,2(),樊玮洁2,*(),毛江鸿2,金伟良1,2
1. 浙江大学 结构工程研究所，浙江 杭州 310058
2. 浙大宁波理工学院 土木建筑工程学院，浙江 宁波 315100
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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摘要：

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    
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.
Key words: concrete durability    electromigration    multi-level electromigration    chloride    uniformity
收稿日期: 2020-02-05 出版日期: 2021-04-25
CLC:  TU 375  
基金资助: 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）
通讯作者: 樊玮洁     E-mail: 21712181@zju.edu.cn;fanwj@nit.zju.edu.cn
作者简介: 宋鑫（1994—），男，硕士生，从事混凝土耐久性研究. orcid.org/0000-0002-6106-1590. E-mail： 21712181@zju.edu.cn
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宋鑫
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引用本文:

宋鑫,樊玮洁,毛江鸿,金伟良. 基于多级电迁的混凝土内氯离子动态控制效果[J]. 浙江大学学报(工学版), 2021, 55(3): 511-518.

Xin SONG,Wei-jie FAN,Jiang-hong MAO,Wei-liang JIN. Dynamic control effect of chloride in concrete based on multi-level electromigration. Journal of ZheJiang University (Engineering Science), 2021, 55(3): 511-518.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.03.011    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I3/511

图 1  多级电迁氯离子控制方法原理及结构示意图
试验目的 试件编号 电迁类型 内置电极/层 通电时间/d
均匀性迁移效果 MI-0 单极电迁 0 18
MI-2 两极电迁 2 18
质量分数控制效果 MC-0 单极电迁 0 18
MC-2 两极电迁 2 18
MC-3 三极电迁 3 27
表 1  试件分组设计
图 2  离子均匀性迁移效果试验布置
图 3  氯离子质量分数控制效果试验布置图
图 4  试件取粉位置
图 5  离子均匀性迁移效果试验显色结果
图 6  氯离子迁出效果
图 7  残余氯离子质量分数分布图
图 8  各深度氯离子质量分数标准差对比
图 9  两级电迁试件电势分布图
图 10  某码头寿命预测曲线与长寿命控制策略
策略 阳极 阴极 控制区域
I 外部阳极 内置电极2 A
II 内置电极2 内置电极1 B
III 内置电极1 钢筋 C
表 2  不同修复策略下的多级电迁电场布置
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