Study on Mechanical Properties and Failure Mechanism of Recycled Brick Aggregate Concrete
LIU Chao1,2,3,4,*, YU Weihang1,4, LIU Huawei2, HU Tianfeng2, HU Huimin2
1 College of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 College of Civil and Architectural Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 3 Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an 710055, China 4 Mechanics Experiment Center, Xi'an University of Architecture and Technology, Xi'an 710055, China
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.
刘超, 余伟航, 刘化威, 胡天峰, 胡慧敏. 再生砖骨料混凝土力学性能及破坏机理研究[J]. 材料导报, 2021, 35(13): 13025-13031.
LIU Chao, YU Weihang, LIU Huawei, HU Tianfeng, HU Huimin. Study on Mechanical Properties and Failure Mechanism of Recycled Brick Aggregate Concrete. Materials Reports, 2021, 35(13): 13025-13031.
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2021, Vol. 35 
