项目名称： 基于电渗作用的替代孔溶液法修复氯离子侵蚀钢筋混凝土结构研究

项目编号： No.51478164

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 徐金霞

作者单位： 河海大学

项目金额： 88万元

中文摘要： 对于已受氯离子侵蚀的钢筋混凝土结构，为了延长使用寿命，需进行修复处理。电化学脱盐是目前唯一能去除氯离子，由此从根源上进行此修复的无损方法，但是，它对钢筋与钢筋/混凝土界面性能有负作用，严重制约其应用。为了克服传统电化学修复方法这一缺陷，本项目首次提出增设一个外部阴极，通过电渗驱除被污染孔溶液，促使外部纯净孔溶液进入孔隙，由此去除氯离子，并恢复钢筋钝态的新方法。拟从混凝土特性与处理工艺研究氯盐环境下混凝土结构孔壁Zeta电位的影响因素、变化规律与调控方法；通过测试组成离子、钢筋腐蚀与混凝土结构物理力学性能，研究该方法修复效果；通过微结构分析，研究作用机理；持续监测钢筋腐蚀电位与腐蚀电流密度，研究长期耐久性，探索提升措施，为实际应用该方法奠定理论与试验基础。本项目系混凝土科学、胶体表面化学与电化学的集成，研究成果可广泛用于普通与预应力钢筋混凝土结构氯离子腐蚀修复，具有重要理论意义和实用价值。

中文关键词： 钢筋混凝土结构；耐久性；氯离子；修复；电渗

英文摘要： It is essential for the reinforced concrete structure contaminated by chloride ions to carry out a repair so as to prolong its service life. To date, the electrochemical chloride exaction is the only nondestructive repair method that can be applied to remove the aggressive chloride ions, which lead to the corrosion of reinforcement in concrete. Despite of this, the application of electrochemical chloride exaction is limited for the fact that it exerts negative effects on the properties of reinforcement and interfaces between the concrete and reinforcement. To overcome this problem, a novel electrochemical repair method has been firstly put forward in this project. It includes that a metal material is added as the cathode. Besides, the pore solution with chloride ions is expelled from the pores of concrete, and the pore solution without chloride ions outside the concrete is driven into the pores of concrete by electroosmosis. A systematical investigation on the influencing factors, regularities and regulating methods of Zeta potential of pore wall is to be conducted from two aspects, namely, concrete performance and treatment process. Besides, it is to examine the effectiveness of this method by the measurements of ionic composition, reinforcement corrosion and physical-mechanical properties of concrete structure, and to investigate the mechanism of this method by the characterization of microstructure. Furthermore, it is to monitor continuously the corrosion potential and corrosion current density of reinforcement so as to decide the long-term durability of chloride contaminated reinforced concrete after the application of this method and its improvement measures. The obtained results will lay experimental and theoretical fundaments for the application of this method. Owing to the fact that it involves concrete technology, colloid and superficial chemistry and electrochemistry, and such a method is suitable not only for the ordinary reinforced concrete structure, but also for the prestressed reinforced concrete structure, this project has great significance in theory and practice.

英文关键词： reinforced concrete structure;durability;chloride ions;repair;electroosmosis