氯盐侵蚀和碱-硅反应(ASR)对混凝土耐久性构成严重威胁。采用电化学技术迁出有害氯离子并迁入含锂抑制剂，能够无损、有效地同时预防钢筋锈蚀和碱骨料损伤两种病害，但目前它的作用机理和长效机制尚未明确。本项目拟借助多个学科的基础理论和技术方法，①基于前期探明的多离子传输/水分-离子耦合传输机制，明确电化学除氯迁锂过程中各驱动参数对多离子传输的影响机理；②提出ASR反应动力参数、电化学反应动力参数和路径曲折度指标，构建骨料-砂浆界面过渡区多离子细微观传输数值模型，揭示电化学处理过程中物化反应-孔隙演变-离子传质三者间的相互影响机理；③探明电化学处理后氯离子浓度分布与钢筋极化过程之间，锂离子滞留量、凝胶膨胀抑制率等细微观特征与混凝土宏观膨胀率之间的定量关系，提出电化学除氯及抑制发展期ASR长期效果的评价方法。本项目成果可为氯盐侵蚀与碱-硅反应的防治，以及既有结构耐久性的提升提供理论基础和技术参考。

Chloride corrosion and alkali-silica reaction (ASR) pose a serious threat to concrete durability. Using electrochemical technology to move out of harmful chloride ions while moving into lithium salts, it also has a good inhibitory effect on ASR, thereby simultaneously and effectively preventing the two diseases of steel corrosion and alkali aggregate damage without damage. However, its inhibition mechanism and long-lasting effect are not yet clear. Based on the basic theories and methods from multi-discipline, this proposal aims to fill the following three knowledge gaps: the mechanism of multi-species transport in concrete driven by electrical field and internal/external environments, the interaction mechanisms between physicochemical reactions, pore evolutions and mass transfer at interfacial transition zones during the electrochemical process, and the quantitative relationships between the retention of lithium ions, the inhibition ratio of ASR-gel swelling and the rate of concrete expansion. Finally, by using the application of multi-scale method and homogenization method, an evolution model and a long term evaluation system on this technology will be established. The outcomes of this research will provide both theoretical and technical supports for solving chloride corrosion and ASR-induced durability problems of RC structures.