滨海自修复混凝土及其性能研究

Service life and reliability of coastal concrete structures have been attached great importance to governments, professional and technical personnel around the world. Compared with the landlocked conventional structure, the coastal structure, supplemented with the long-term corrosive effect, reflects the diversity of functional class and the emergence of working effect and the breadth of the object and so on. Although scholars have made important progress in the concrete corrosion, the performance degradation mechanism and inhibition of protection, but because of the macro-micro mechanisms of materials, components and structural systems, the role of time span, the multiple corrosive environment and the role of reality-threatening different types of buildings and structures, the current theory of durability and renovation for structure is still mainly on the basis of experience and qualitative cognitive. This project focuses on coastal concrete with the key issues of the cracking penetration and ion erosion, specifically develops new self-healing concrete system. And the systematic study is carried out of the material design, the release process, the repair mechanism and repair effects. With the loop interaction through theoretical research and engineering applications, the establishment of coastal concrete repair materials, system design, the role of process, impact assessment and other aspects research strategy, provides the service life guarantee for the full implementation of the coastal major civil engineering structures.

滨海混凝土结构的服役寿命及可靠性问题受到了世界各国政府、专业技术人员的高度重视。与内陆常规结构相比，滨海结构附加了长期腐蚀作用，体现出作用类别的多样性、作用效应的涌现性及作用对象的广泛性等特征。尽管国内外学者在混凝土腐蚀规律、性能劣化机理及抑制防护等方面取得了重要进展，但由于涉及材料、构件和结构系统的宏微观机制，作用时间跨度大、现实中又存在多重腐蚀环境作用危及不同类型的建筑物和构筑物，目前的结构耐久性理论及其修复技术仍主要建立在经验和定性认知的基础上。本项目关注滨海混凝土中存在的开裂渗透、离子侵蚀这两个方面的关键问题，针对性地设计新型自愈合仿生混凝土体系，系统性地研究其材料设计、释放过程、修复机理以及修复效果等各个环节的关键要素；通过理论研究与工程应用的循环互动，建立滨海混凝土自修复材料的系统设计、作用过程、效果评估等多个环节的研究策略，为全面实施滨海重大土木工程结构服役寿命保障提供保证。

本项目基于前述滨海环境下混凝土研究的国内外现状，提炼出滨海混凝土综合劣化中开裂渗透（物理作用）、离子侵蚀（化学作用）这两个方面的关键问题；并基于差异性的混凝土劣化机制，分别发展出有针对性的滨海混凝土自修复体系；系统性地研究其材料设计、释放过程、修复机理以及修复效果等各个环节的关键要素，以实现和提高滨海混凝土结构的耐久性和安全性。. 本项目针对滨海混凝土综合劣化中关键问题；提出新型的表征方法，进行定量化评估；发展了新型的混凝土微胶囊自修复体系；系统性地研究其材料设计、释放过程、修复机理以及修复效果等各个环节的关键要素，以实现和提高滨海混凝土结构的耐久性和安全性。.本项目成功执行，已发表论文20篇，其中SCI论文16篇；申请专利26项，授权发明专利11项；培养博士1人；培养硕士9人，毕业2人；培养其他工程技术人员3名。做大会/特邀报告3次（第一届全国可持续混凝土理论与应用技术学交流会、第三届全国防灾减灾工程学术会议、第一届“中英可持续发展混凝土材料制备及应用技术”论坛）。