【摘要】 混凝土因水泥浆体与集料材料特性差异,胶结过程中易在集料-浆体接触带出现界面过渡区(ITZ)。前期大量研究表明:ITZ是混凝土损伤、断裂最先发生区域。本文全面归纳ITZ微-细结构及微观力学识别技术,梳理现阶段识别技术的发展状况及存在问题,并借此展望下阶段精确识别ITZ技术的发展方向;基于现浇混凝土成型、水化、硬化微-细观过程分析,从ITZ微-细观结构形成特点及影响因素出发,探讨混凝土ITZ形成机制及主控指标;为更好认知ITZ微-细观多尺度特性评价,开展了国内外代表性ITZ结构模型归纳分析,并探究各模型的核心思路及适用范围。本研究可为系统掌握混凝土ITZ识别技术、形成机制及评价模型提供全面借鉴作用。更多还原

【Abstract】 Due to the difference in the properties of cement paste and aggregate materials, the interfacial transition zone(ITZ) is easy to appear in the aggregate paste contact zone during the cementing process. A large number of previous studies have shown that ITZ is the first area where concrete damage and fracture occur. This paper summarized the ITZ microstructure and micromechanical identification technology, sorted out the development status and existing problems of the identification technology at this stage, and looked forward to the development direction of the accurate identification of the ITZ technology in the next stage. Based on the analysis of the microscopic process of casting, hydrating and hardening of cast-in-place concrete, starting from the formation characteristics and influencing factors of ITZ microstructure, the formation mechanism and main control indicators of concrete ITZ were discussed. In order to better understand the evaluation of ITZ micro-meso and multi-scale characteristics, inductive analysis of representative ITZ structural models at home and abroad were carried out, and the core ideas and application scope of each model were explored. This study provides a comprehensive reference for systematically grasping the concrete ITZ identification technology, formation mechanism and evaluation model.更多还原