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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (12): 2317-2324    DOI: 10.3785/j.issn.1008-973X.2019.12.008
土木工程、水利工程     
基于双向电迁移的开裂混凝土除氯阻锈效果
元斐斌1,2(),金伟良1,2,毛江鸿2,*(),王金权3,樊玮洁2,夏晋1
1. 浙江大学 结构工程研究所，浙江 杭州 310058
2. 浙江大学宁波理工学院 土木建筑工程学院，浙江 宁波 315100
3. 宁波市杭州湾大桥发展有限公司，浙江 宁波 315317
Effect of chloride removal and corrosion prevention for cracked concrete based on bi-directional electro-migration rehabilitation
Fei-bin YUAN1,2(),Wei-liang JIN1,2,Jiang-hong MAO2,*(),Jin-quan WANG3,Wei-jie FAN2,Jin XIA1
1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
3. Hangzhou Bay Cross-sea Bridge Development Co. Ltd, Ningbo 315317, China
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摘要：

采用双向电迁移（BIEM）方法对沿海环境下的开裂混凝土进行修复，以排除裂缝附近富集的氯离子，并对钢筋进行阻锈防护. 通过测定阻锈剂浓度、氯离子质量分数以及钢筋极化曲线，研究不同裂缝宽度下BIEM的作用效应，并通过氯离子迁移特征试验对氯离子的迁移规律加以验证. 试验结果表明：开裂混凝土双向电迁移后，钢筋腐蚀电位均能恢复至较高水平；当裂缝宽度较小时，混凝土保护层中氯离子的迁移规律与未裂混凝土相近；当裂缝宽度大于0.3 mm时，裂缝处的氯离子排出效率随裂缝宽度的增加有所提高，但离裂缝较远处的氯离子排出效率有所降低.
关键词： 混凝土耐久性;  裂缝宽度;  双向电迁移（BIEM）;  腐蚀电位;  氯离子;  阻锈剂    
Abstract:

The bi-directional electro-migration (BIEM) method was used to repair the cracked concrete in the marine environment, in order to eliminate the chloride enriched in the vicinity of the crack and to prevent corrosion of the steel bars. The effect of BIEM under different crack widths was studied by measuring the concentration of rust inhibitor, mass fraction of chloride ion and the polarization curve of reinforcement. The chloride migration law was verified by the chloride migration characteristic test. Results that the corrosion potential of the steel can be restored to a high level after BIEM of the cracked concrete. When the crack width is small, the migration law of chloride ion in concrete cover is similar to that of the uncracked concrete. When the cracked width in concrete is greater than 0.3 mm, the chloride ion discharge efficiency at the crack increases with the increase of the crack width, while the discharge efficiency of chloride ion farther from the crack decreases.
Key words: concrete durability    crack width    bi-directional electro-migration (BIEM)    corrosion potential    chloride    corrosion inhibitor
收稿日期: 2018-11-04 出版日期: 2019-12-17
CLC:  TU 375  
基金资助: 国家自然科学基金资助项目（51878610，51638013，51578490）；浙江省自然科学基金资助项目（LY18E080003，LQ19E080012）；宁波市自然科学基金资助项目（2018A610359，2017A310313）
通讯作者: 毛江鸿     E-mail: 21612162@zju.edu.cn;jhmao@nit.zju.edu.cn
作者简介: 元斐斌（1994—），男，硕士生，从事混凝土耐久性研究. orcid.org/0000-0002-8229-4588. E-mail： 21612162@zju.edu.cn
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引用本文:

元斐斌,金伟良,毛江鸿,王金权,樊玮洁,夏晋. 基于双向电迁移的开裂混凝土除氯阻锈效果[J]. 浙江大学学报(工学版), 2019, 53(12): 2317-2324.

Fei-bin YUAN,Wei-liang JIN,Jiang-hong MAO,Jin-quan WANG,Wei-jie FAN,Jin XIA. Effect of chloride removal and corrosion prevention for cracked concrete based on bi-directional electro-migration rehabilitation. Journal of ZheJiang University (Engineering Science), 2019, 53(12): 2317-2324.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.12.008    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I12/2317

图 1  开裂混凝土双向电迁移（BIEM）原理示意图
图 2  开裂混凝土通电状态下电势分布示意图
编号 ρ /(kg·m?3)
水 水泥 砂子 石子 氯化钠
C30 206.7 406.7 633.3 1050 20.3
表 1  C30混凝土试件配合比
图 3  BIEM试件和氯离子迁移特征试验试件示意图
图 4  沿试件长度方向及保护层厚度方向取粉位置
图 5  BIEM前、后各裂缝宽度试件组的钢筋弱极化曲线
试件组 Ecorr /mV $ E'_{\rm{corr}}$/mV
单值 均值 单值 均值
A-0 ?480 ?463 ?180 ?172
?456 ?191
?455 ?145
A-0.1 ?431 ?430 ?162 ?166
?391 ?157
?468 ?180
A-0.3 ?430 ?437 ?157 ?161
?448 ?179
?432 ?146
A-0.5 ?484 ?457 ?182 ?166
?436 ?155
?452 ?162
A-0.7 ?476 ?491 ?142 ?160
?504 ?156
?494 ?183
A-1.0 ?501 ?470 ?158 ?149
?414 ?143
?494 ?147
表 2  双向电迁移（BIEM）前、后钢筋腐蚀电位
图 6  BIEM后混凝土保护层中氯离子的质量分数分布图（初始值为0.221 5%）
图 7  各试件显色边界线示意图
图 8  不同裂缝宽度试件的显色边界线分布
图 9  各试件氯离子质量分数为定值（0.03%）时的位置分布图
图 10  钢筋表面层不同位置处的氯离子质量分数对比
图 11  钢筋附近阻锈剂质量摩尔浓度对比
w/mm x0 /mm R w/mm x0 /mm R
0 0 28.36 0.1 0 26.54
20 27.16 20 26.24
60 28.80 60 25.24
0.3 0 33.05 0.5 0 31.97
20 27.99 20 27.24
60 28.60 60 28.93
0.7 0 36.49 1.0 0 45.13
20 20.72 20 15.13
60 17.70 60 10.8
表 3  钢筋附近阻锈剂与氯离子浓度比
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