Reinforced concrete structures exposed to marine environments often experience chloride ingress, reinforcement corrosion, and corrosion-induced cracking. The electrochemical repair method is a promising concrete rehabilitation technique with advantages of non-destructive and economic performance in crack repair, chloride removal, and corrosion protection, which is particularly suitable for structures exposed to marine environments. This work presents an innovative methodology for modeling the mechanical, transport, and chemical process during electrochemical treatment for marine concrete structures. The entire process from concrete cracking up to repairing can be successfully reproduced and digitally visualized. The first sub-model calculates the corrosion-induced cracking process at the mesoscopic level with the consideration of local mechanical variances of concrete composites. Then, a reactive transport sub-model is established to reveal the interactions and electrochemical reactions among various species of ions. A crack repair sub-model is built to visualize the moving interface between chemical deposition and crack surface. Through combining the three sub-models, the interconnected influencing factors in practical engineering can be quantitively investigated. The calculation results show that, compared with electrolyte concentration, the influence of current density on crack closure rates are more obvious. Other factors such as steel reinforcement diameter and crack distribution pattern, which have not been previously reported are highlighted. These findings can guide the application of electrochemical repair in practical engineering.

中文翻译：

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海洋混凝土腐蚀开裂电化学修复方法的机械-传输-化学建模

暴露在海洋环境中的钢筋混凝土结构经常会出现氯化物侵入、钢筋腐蚀和腐蚀引起的开裂。电化学修复方法是一种很有前途的混凝土修复技术，在裂缝修复、氯化物去除和腐蚀防护方面具有无损和经济的优点，特别适用于暴露于海洋环境的结构。这项工作提出了一种创新的方法，用于模拟海洋混凝土结构电化学处理过程中的机械、传输和化学过程。从混凝土开裂到修复的整个过程都可以成功复制和数字化可视化。第一个子模型在考虑混凝土复合材料局部力学变化的情况下，在细观水平上计算腐蚀引起的开裂过程。然后，建立反应传输子模型来揭示各种离子之间的相互作用和电化学反应。建立裂纹修复子模型以可视化化学沉积和裂纹表面之间的移动界面。通过结合这三个子模型，可以定量研究实际工程中相互关联的影响因素。计算结果表明，与电解液浓度相比，电流密度对裂纹闭合率的影响更为明显。其他因素，如钢筋直径和裂缝分布模式，以前没有报道过。