再生砖骨料混凝土力学性能及破坏机理研究

doi:10.11896/cldb.20050255

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Abstract In this work, 8 kinds of recycled brick aggregate lightweight concrete with design mix ratio were taken as the research object, and water-cement ratio, maximum aggregate size and coarse aggregate type were taken as the test parameters. Experiments on dry density, cube compressive strength and split tensile strength of concrete were carried out, and the interface characteristics of aggregate and failure mechanism of recycled brick aggregate concrete were analyzed emphatically. The results show that the 28 d compressive strength of the secondary lightweight concrete prepared with recycled clay brick aggregate can reach 36 MPa, and the dry density is no more than 2 200 kg/m³, which can reduce the dead weight by 8%—16%. With the decrease of water-cement ratio and replacement ratio, the compressive and splitting tensile strength of concrete increased significantly. The maximum aggregate size had little influence on the compressive and splitting tensile strength of concrete. The correlation between the fitted concrete dry density and the conversion formula of mechanical properties was good. The microstructure of brick aggregate-mortar interfacial transition zone was relatively compact, and the interfacial performance of concrete was enhanced. The performance of interfacial transition zone and the strength of brick aggregate were two key factors affecting the mechanical properties of recycled brick aggregate concrete, and the strength of brick aggregate was the most important one. Taking the recycled clay brick aggregate into consideration, it had a good economic and engineering prospect to prepare the specific density concrete.

Key words： construction waste recycled clay brick aggregate specific density concrete mechanical properties failure mechanism

Published: 14 July 2021

CLC number:

TU528.041

Fund:This work was financially supported by the National Natural Science Foundation of China (51878546), Science Foundation for Distinguished Young Scholars of Shaanxi Province (2020JC-46), the Key Research and Development Projects of Shaanxi Province (2018ZDCXL-SF-03-03-02), the Science and Technology Innovation Base of Shaanxi Province (2017KTPT-19) and the Innovative Talent Promotion Plan of Shaanxi Province (2018KJXX-056).

About author:: Chao Liu, is a professor and doctoral tutor in the College of Science of Xi’an University of Architecture and Technology. Professional committee member of International Union of Laboratories and experts in construction materials, systems and structures and FIB. He is also the professional committee member of recycled concrete of China Civil Engineering and the chairman of the Solid Waste Subcommittee of the Chinese Ceramic Society. He has long been committed to the research of the recycling of construction solid waste and recycled building materials and intelligent construction technology. He presided over 12 national and provincial scientific research projects such as National Key R&D Program of China, the National Natural Science Foundation of China, and China Postdoctoral Science Foundation; 19 authorized patents; 1 editor of national industry standards. He successively won Science Foundation for Distinguished Young Scholars of Shaanxi Province, Shaanxi Province “Science and Technology Star” title, was selec-ted as the “Young Outstanding Talents” support plan of Shaanxi colleges and universities; won the first and second prizes of science and technology in Shaanxi Province, and 5 first prizes of science and technology in Shaanxi universities.

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	LIU Chao
	YU Weihang
	LIU Huawei
	HU Tianfeng
	HU Huimin

Cite this article:

LIU Chao,YU Weihang,LIU Huawei, et al. Study on Mechanical Properties and Failure Mechanism of Recycled Brick Aggregate Concrete[J]. Materials Reports, 2021, 35(13): 13025-13031.

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http://www.mater-rep.com/EN/10.11896/cldb.20050255 OR http://www.mater-rep.com/EN/Y2021/V35/I13/13025

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