Electrochemical realkalization has been applied to many concrete structures deteriorated by carbonation of concrete. As the repair effect of this method, it has been reported that the pH value of the carbonated concrete recovered by the electrolysis reaction at the steel in concrete and the electro-osmosis of the electrolyte solution in the anode system set on the concrete surface. However, the protection effect of the realkalization against the steel corrosion in concrete has not been clarified enough. Therefore, this study investigated the steel corrosion behavior in concrete after the application of realkalization in the cases of different degree of deterioration and different kind of electrolyte solution by measuring content profiles of several sort of ions and electrochemical indicators for evaluating steel corrosion. As a result, the electrochemical removal of Cl^- ions from carbonated concrete and the electrochemical penetration of K⁺ ions from the electrolyte solution into carbonated concrete were both promoted compared with the case of non-carbonated specimen. Moreover, the protection ratio calculated by the corroded area ratio of steel bars in the electrochemically treated specimens and non-treated specimens subjected to the cyclic drying and wetting storage for 400 days after the period of realkalization achieved around 80% regardless of the difference of the deterioration condition before applying realkalization. This paper is an extended and enhanced version of an earlier work under different title [Takahashi, H., Ueda, T., Nanasawa, A., Nakayama, K. and Tsukagoshi, M., (2020). “Repair effect of realkalization for reinforced concrete with different degree of deterioration.” In: Proceedings of the 6th International Conference on Concrete Materials - Performance, Innovations, and Structural Implications (ConMat’20), Fukuoka, Japan 27-29 August 2020. Tokyo: Japan Concrete Institute, 1065-1075].

电化学再碱化已应用于许多因混凝土碳化而劣化的混凝土结构。作为该方法的修复效果，据报道，通过混凝土中钢的电解反应和设置在混凝土表面的阳极系统中的电解质溶液的电渗透，可以恢复碳酸混凝土的pH值。然而，再碱化对混凝土中钢筋腐蚀的保护作用尚未得到充分阐明。因此，本研究通过测量几种离子的含量分布和评价钢筋腐蚀的电化学指标，研究了在不同劣化程度和不同电解质溶液情况下应用再碱化后混凝土中钢筋的腐蚀行为。其结果，^-碳酸混凝土中的离子和 K ⁺的电化学渗透与非碳酸化试样的情况相比，电解质溶液中的离子进入碳酸化混凝土都得到了促进。此外，再碱化期后经过400天循环干湿储存的电化学处理试件和未处理试件的钢筋锈蚀面积比计算得到的保护率均达到80%左右。应用再碱化前的恶化条件。本文是不同标题下早期工作的扩展和增强版本 [Takahashi, H., Ueda, T., Nanasawa, A., Nakayama, K. 和 Tsukagoshi, M., (2020)。《再碱化对不同劣化程度钢筋混凝土的修复效果》。在：第六届混凝土材料国际会议论文集 - 性能、创新和结构影响 (ConMat'20)，日本福冈，2020 年 8 月 27-29 日。东京：日本混凝土研究所，1065-1075]。