在高性能轻集料混凝土自重轻、抗震性好等优势基础上，籍轻集料表面特性负载智能材料进行功能化设计，凭借集料体积占比大对侵入氯离子进行拦截，为改善轻集料混凝土在海洋环境中耐久性提供新的有效途径。通常，响应性水凝胶遇水溶胀，且随溶液盐浓度增加而降低直至破坏，更缺少在多因素下对目标离子的响应研究。本课题针对海洋环境用轻集料混凝土受氯离子威胁，依据反聚电解质效应、阴离子水合能力差异及基团功能，设计并制备在多因素下可对氯离子作出正响应的智能水凝胶，弄清其功能基团与离子间相互作用及吸水-释水机理；通过原位聚合、相转变负载等，研究并提出轻集料有效负载水凝胶的关键技术；通过热力学计算、微结构量化表征及氯离子传输过程，阐明在界面区复杂微环境中水凝胶对氯离子的固化作用机制。研究将实现轻集料混凝土在氯离子富集时自识别、自响应，有效提升抗氯离子渗透性能，为海洋环境用高性能混凝土材料的开发和应用奠定理论和试验基础。

In addition to the advantages of light weight and excellent seismic performance of high performance lightweight aggregate concrete (HPLWC), the lightweight aggregates have the potential of being functional designed by loading intelligent materials due to the surface features. Since the aggregates occupy the largest volume of concrete, the functional lightweight aggregate can be used to resist chloride penetration. This exploration will provide a new and effective way to improve the durability of HPLWC. The traditional responsive hydrogels will swell after getting in touch with water, and the swelling decreases with increasing salt concentration until collapsing. There is a lack of investigation on the responsive behavior of hydrogel stimulated by a certain type of ion in mixed salt solution. This project is designed in the context of the threat to HPLWC caused by chloride penetration in marine structures. According to the anti-polyelectrolyte effect, the different hydration ability among various anion and the electrostatic action, an intelligent hydrogel with the ability of positive response (the swelling is more remarkable with increasing chloride concentration), will be designed and prepared. The interaction between functional groups in hydrogel and the external ions, the mechanism of water absorption and releasing will be clarified. Through in-situ polymerization and loading after phase transition, a key technology of loading the prepared hydrogel on lightweight will be investigated and proposed. By using thermodynamic calculation, determining microstructure quantitatively and evaluating chloride penetration, the mechanism of chloride binding by hydrogel in the complex micro-environment of interfacial transition zone will be determined. The so prepared HPLWC will be able to self-identification and self-response after the penetrated chlorides content reaching a threshold value. The research will provide an effective way to improve the chloride resistance ability, and lay a solid theoretical and experimental foundation for the development of high performance concrete used in marine environment.