Study on the durability improvement of cracked concrete based on bidirectional electromigration rehabilitation
Study on the durability improvement of cracked concrete based on bidirectional electromigration rehabilitation
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基于双向电迁移修复的裂缝混凝土耐久性提升研究
DOI：
10.1016/j.conbuildmat.2021.122453
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发表时间：
2021
影响因子：
7.4
通讯作者：
Xiaoping Zhong
中科院分区：
文献类型：
--
作者：
Weijie Fan;Jianghong Mao;Weiliang Jin;Jun Zhang;Xiaoping Zhong
为了研究沿海混凝土裂缝的双向电迁移效应，通过数值模拟和试验研究，确定了裂缝的相对位置和宽度对氯离子去除和缓蚀效果的影响。结果表明，在通电状态下，裂纹内的电流比其他位置的电流大，从而产生电流集中效应。如果应用Biem技术，裂缝混凝土中的钢筋腐蚀电位可以恢复到很高的水平。横向裂纹宽度对腐蚀电位恢复影响不大，而纵向裂纹宽度越大，腐蚀电位恢复效果越好。当裂缝宽度小于0.1 mm时，BIEM对氯离子的去除和缓蚀效果与未开裂混凝土相似。大于0.1 mm时，随着裂缝宽度的增加，氯离子的去除效率和缓蚀剂在裂缝中的迁移效率增加，但在远离裂缝的位置，去除氯离子和缓蚀剂的效率降低。
In order to study the effect of Bidirectional Electromigration (BIEM) in cracked coastal concrete, the influence of the relative position and width of a crack on chloride removal and corrosion inhibition was ascertained through numerical simulation and experimental research. The results showed that, in the power-on state, the current in the crack was higher than that on other positions, leading to current concentration effect. If the BIEM technique was applied, the steel bar corrosion potential in cracked concrete could be restored to a high level. The width of a transverse crack had no significant influence on the corrosion potential restoration, while a longitudinal crack had better corrosion potential restoration effect as the cracks became wider. When the crack width was less than 0.1 mm, BIEM presented a similar chloride removal and corrosion inhibition effect to that in the uncracked concrete. If more than 0.1 mm, the efficiency of removing chloride ions and migrating corrosion inhibitor in the crack increased with the crack width, but decreased on the positions far from the crack.