Compressive Strength and Microscopic Damage of Recycled Sand/Powder Concrete

Abstract

Abstract: To investigate the mechanical properties and microscopic damage evolution of recycled sand/powder concrete, ABAQUS based on Python language was used to establish a multi-phase three-dimensional finite element model considering virgin aggregate, old/new mortar matrix and corresponding interfacial transition zones. The effectiveness of the model was verified by compressive tests on recycled sand/powder concrete samples. The results show that the microscopic model of recycled sand/powder concrete established in this study efficaciously simulates its mechanical properties and microscopic damage circumstances. The discrepancy between the measured and simulated compressive strength is minimal, not exceeding 10.65%. The destruction of recycled sand/powder concrete specimen is generally in an “X” shape, which is fundamentally consistent with experimental phenomenon. The initial damage emerges in interface transition zone and subsequently develops progressively until it penetrates. As the content of recycled fine aggregate and recycled micro powder increases, the extent of damage expansion becomes more severe, and its mechanical properties correspondingly decline.

Key words: recycled sand/powder concrete, multi-phase model, numerical simulation, finite element model, mechanical property, damage distribution, random aggregate

CLC Number:

TU528

MA Quan, XIAO Jianzhuang, TIAN Feng, YAN Wenpin, SONG Min, FU Jie, YANG Chao, CAO Xue. Compressive Strength and Microscopic Damage of Recycled Sand/Powder Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4042-4050.

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