Abstract

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Title:: Review of Failure Mechanism and Modification Research of Recycled Aggregate Concrete

Author(s):: LI Wen-gui; LONG Chu; LUO Zhi-yu; HUANG Zheng-yu; LONG Bing-huang; REN Jie-qiang; College of Civil Engineering, Hunan University

Keywords:: recycled aggregate concrete; failure mechanism; modification; mechanical property; review

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.