外加电流阴极保护技术是钢筋混凝土腐蚀防护的有效手段，但是存在外部阳极砂浆易受酸化侵蚀、保护电流分布不均匀等弊端。本项目拟制备负载导电组分的导电多孔轻骨料和包裹碱性物质的微胶囊自修复材料。导电多孔轻骨料和微胶囊自修复材料应用于外部阳极砂浆中，一方面可以提高砂浆以及金属阳极/砂浆和砂浆/混凝土界面的导电性，改善保护电流分布；另一方面可以恢复外部阳极砂浆的碱度，抑制孔溶液酸化对外部阳极砂浆的侵蚀作用。由此开发的高稳定性外部阳极砂浆可以提高外加电流阴极保护效率的稳定性和钢筋混凝土的耐久性。课题将围绕导电多孔轻骨料和微胶囊自修复材料的设计和制备，及其对外部阳极砂浆导电均匀性和抗酸化侵蚀性能的影响等方面展开研究，揭示导电多孔轻骨料和微胶囊自修复材料的制备原理与方法，及其由此制备的高稳定性外部阳极砂浆提高外加电流阴极保护效率稳定性的作用机制，为研发更高效的钢筋混凝土腐蚀防护与修复新技术提供科学理论依据。

Impressed current cathodic protection is considered as an efficient method for corrosion protection of reinforced concrete; however, there are some limitations and drawbacks for this technique, i.e. acid erosion of the external anode mortar, un-uniform distribution of the protection current. In this project, the conductive porous lightweight aggregates (loaded with conductive components) and self-healing microcapsule materials (encapsulated with alkaline substances) will be prepared. When the conductive porous lightweight aggregates and self-healing microcapsule materials are applied in the external anode mortar, on one hand, the conductivity of the mortar, anode/mortar interface and mortar/concrete interface can be increased, leading to a more uniform distribution of the protection current; on the other hand, the alkalinity of the external anode mortar can be restored and the erosion effect on the external anode mortar caused by the acidification of pore solution is halted. Therefore, the external anode mortar of superior stability prepared with the conductive porous lightweight aggregates and self-healing microcapsule materials can improve the protection efficiency stability of impressed current cathodic protection and durability of reinforced concrete. The investigations in this project include the design and preparation of the conductive porous lightweight aggregates and self-healing microcapsule materials, and their effect on the conductivity uniformity and acid erosion resistance of the external anode mortar. Therefore, the preparation principles and methods of the conductive porous lightweight aggregates and self-healing microcapsule materials, and the mechanisms related to the effect of the prepared external anode mortar of superior stability on the protection efficiency stability of impressed current cathodic protection will be revealed in order to provide the theoretical basis of a new highly efficient corrosion protection and repair method for reinforced concrete.