针对铺面结构热灌类灌缝胶从传统粘附/粘聚失效向老化失效转变趋势，探索在役灌缝胶多源环境耦合作用下老化机理及主动修复机制。首先，基于“老化等效”原则，建立灌缝胶多源环境耦合作用(热、氧、光、水、盐)量化方法及室内短期、长期老化模拟方法；其次，引入“等量拆分”原则，研究单因素及多因素耦合作用下灌缝胶化学组成、微观结构、宏观性能变化规律及组分间交互作用，揭示其老化机理；而后，借助组分调节/晶核分散理论，研究在役灌缝胶主动修复材料组成及制备工艺，并基于分子动力学模拟，探讨修复剂与老化灌缝胶交互作用机制；最后，提出理想混溶和实际服役状态下修复灌缝胶材料及表面性能评价方法，研究修复剂在老化灌缝胶表面扩散规律及修复路径，探索其主动修复机制。.本研究突破铺面结构裂缝修复中重复灌缝做法，为在役灌缝胶表面功能主动修复奠定理论基础，也为铺面快速养护技术的发展提供新方向。研究对交通基础设施耐久性提升具有推动作用。

Aiming at the transforming trend from traditional adhesion/cohesion failure to aging failure for hot-poured sealant specialized in pavement structure, the aging mechanism and active remediating mechanism of in-service sealant, subjected to multi-source environment coupling action, are explored systematically. Firstly, based on the principle of ‘aging equivalence’, the quantitative methodology of multi-source environmental coupling (heat, oxygen, radiation, moisture and salt) and indoor short-term and long-term aging simulation procedures are established. Secondly, the principle of ‘equal separation’ is introduced to investigate the variation rules of chemical composition, microstructure, macro-performance as well as the interaction among sealant components under single or multi-factor coupling action, which is utilized to explore the aging mechanism. Next, combing with the component regulation/nucleus dispersion theory, the composition and preparation technology of active remediating agent for in-service sealants is studied. Meanwhile, the interaction mechanism between remediating agent and aged sealant is discussed based on molecular dynamics simulation. Finally, the internal and surface performance evaluation methodologies of the remediated sealant under ideal blending and actual service conditions are proposed. The laws of surface diffusion and rehabilitation path of remediating agent on aging sealant are explored to illustrate the active remediating mechanism.. This research breaks through traditional repeated grouting means in crack repair of pavement structure, which lays theoretical foundation for active rehabilitation of surface function of in-service sealant, and provides a new direction for the development pavement rapid maintenance. The research proposed herein promotes the durability improvement of transportation infrastructure.