再生骨料混凝土破坏机理与改性研究综述.doc

再生骨料混凝土破坏机理与改性研究综述 　　摘要：针对再生骨料混凝土破坏机理与破坏性能改性研究做了系统性的归纳和总结。提出了再生骨料混凝土的研究背景、思路、目标、内容和技术路线的改性研究体系。根据再生骨料混凝土受拉破坏和受压破坏的破坏形态和断面特征总结了其破坏的一般规律，依据破坏机理得到再生骨料混凝土力学性能提高的改性研究思路，并提出了相应的改性方法。介绍了再生骨料的强化技术，如纳米材料、纤维材料和矿物添加剂改性再生骨料混凝土的研究，归纳了再生骨料混凝土需进一步解决的问题，即再生骨料加工机制的形成、数值模拟技术的发展、应用体系的形成和有效监测机制的建立。结果表明：界面过渡区是再生骨料混凝土的最薄弱区域，改善再生骨料混凝土的破坏性能最为关键的是强化界面过渡区；相关结论可为改善再生骨料混凝土破坏性能和推广其在工程中的应用提供支持。 　　关键词：再生骨料混凝土；破坏机理；改性；力学性能；综述 　　中图分类号：TU528文献标志码：A 　　Abstract： The failure mechanism and modification research of damage performance of recycled aggregate concrete （RAC） were systematically summarized. The research background， idea， objective， content and technical route of recycled aggregate concrete were put forward. According to the failure mode and fracture characteristics of recycled aggregate concrete under tensile and compressive damage， the general laws of damage were summarized. Based on the failure mechanism， the modification research ideas of improving the mechanical properties were obtained， and the modification method was proposed. The strengthening technology of recycled aggregate was introduced， such as nano materials， fiber materials and mineral additives used to modify recycled aggregate concrete. The problems that need to be solved for recycled aggregate concrete were also summarized， including the formation of recycled aggregate processing mechanism， the development of numerical simulation technology， the formation of application system and the establishment of effective monitoring mechanism. The results show that interfacial transition zone is the weakest area of recycled aggregate concrete， and strengthening the interfacial transition zone is the key to improve the failure behavior of recycled aggregate concrete. The relevant conclusion can be used to provide support for improving the performance of recycled aggregate concrete and its application in engineering. 　　Key words： recycled aggregate concrete； failure mechanism； modification； mechanical property； review 　　0引言 　　随着