滨海混凝土氯离子智能抑制系统设计与性能研究

This proposal focuses on the deterioration of reinforcement in concrete due to the high chloride in coastal environment. A novel concept of chlorine ion triggered microcapsule is proposed for the first time. Based on the design of the chloride ion triggered microcapsule, the intelligent suppression system against chloride ingress will be developed; the concrete micro-structure and mechanical properties will be investigated; the corrosion process in this suppression system will be characterized; the trigger and suppression mechanism of the proposed microcapsule will be proven; and finally meet the challenge of improving the durability of reinforced concrete in the coastal environment. The proposed suppression system can effectively suppress the migration of chloride ions in concrete and intelligently control the chloride concentration. This idea will have widespread beneficial effect on the corrosion protection of metal materials, which can form a wide range of intelligent corrosion suppression method for metal corrosion in the coastal environment. This study has positive theoretical significance and engineering application value.

本项目针对滨海环境主要是高氯离子浓度导致钢筋锈蚀以致混凝土失效的问题，首次提出制备氯离子触发微胶囊的新概念，设计新型氯离子触发微胶囊，以此为基础制备滨海混凝土氯离子智能抑制系统，研究其微观结构、力学性能及钢筋锈蚀特征；探明微胶囊触发机制、抑制机理；最终保障并提升滨海混凝土的耐久性目标。本申请提出的原创性设计可有效抑制混凝土中氯离子迁移并智能调控氯离子浓度，其思想对金属材料的腐蚀和防护将产生普遍有利的影响，可形成广泛的滨海腐蚀环境金属材料的智能抑制方法；具有积极的理论意义和工程应用价值。

本项目针对滨海环境主要是高氯离子浓度导致钢筋锈蚀以致混凝土失效的问题，首次提出制备氯离子触发微胶囊的新概念，设计新型氯离子触发微胶囊，以此为基础制备滨海混凝土氯离子智能抑制系统。本项目的执行过程顺利，获得了一系列原创性研究结果。主要内容包括：（1）探索制备了基于聚电解质和基于纳米银的两种新型氯离子触发微胶囊，并详细探究了两种微胶囊体系的制备工艺、结构特征和氯离子触发机制；（2）研究了微胶囊与混凝土的分散复配工艺，获得了微胶囊分散均匀、力学性能优良的复合混凝土体系；（3）验证了微胶囊在模拟滨海混凝土环境中的稳定性及氯离子响应效能；（4）分析了复合混凝土在完成氯离子触发修复后的电化学腐蚀状况和耐久性指标。最终，基于上述研究成果，本项目探讨了提升滨海混凝土耐久性的本质，归纳了基于裂纹修复的混凝土氯离子扩散抑制机理，为具有现实意义的滨海混凝土氯离子智能抑制系统的开发打下了坚实基础。