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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。
A systematic summarization and summary of the research on the failure mechanism and failure performance of recycled aggregate concrete are made. The research background, ideas, goals, contents and technical system of recycled aggregate concrete are proposed. Based on the failure morphology and section characteristics of recycled aggregate concrete under tension and compression failure, the general rules of its failure are summarized. Based on the failure mechanism, the modified method of improving the mechanical properties of recycled aggregate concrete is proposed and the corresponding modification method. The paper introduces the strengthening technology of recycled aggregates, such as nano-materials, fiber materials and mineral additives modified recycled aggregate concrete, summarizes the need to further solve the problem of recycled aggregate concrete, that is, the formation of recycled aggregate processing mechanism, numerical simulation The development of technology, the formation of application system and the establishment of effective monitoring mechanism. The results show that the interfacial transition zone is the weakest area of recycled aggregate concrete. The key point to improve the destructive performance of recycled aggregate concrete is to strengthen the interfacial transition zone. The relevant conclusions may be to improve the failure performance of recycled aggregate concrete and promote its application in engineering The application of support.