Mesoscopic Simulation Study on Uniaxial Compression of Distributing-Filling Coarse Aggregate Concrete

doi:10.16552/j.cnki.issn1001-1625.2024.1591

Abstract

Abstract: In this paper, a two-dimensional concrete mesoscopic model containing macropores was established based on the random aggregate model. Based on verifying the reliability of the model, the damage and failure process of distributing-filling coarse aggregate (DFCA) concrete was studied, and the influences of different macro-porosities and DFCA ratios on the mechanical behavior of concrete were analyzed. The results indicate that, the damage in DFCA concrete first occurs near macropores and the interfacial transition zone of the reference aggregate, then develops in the interfacial transition zone of the DFCA, and finally develops to the mortar matrix. With the increase of macro-porosity, the compressive strength and elastic modulus of concrete decrease, and the increase of DFCA ratio weakens the influence of macropores on the properties of concrete. Under different DFCA ratios, the compressive strength and elastic modulus of concrete show a trend of first increase and then decrease. When the DFCA ratio is 20%, the compressive strength and elastic modulus of concrete reach their maximum values.

Key words: distributing-filling coarse aggregate concrete, mesoscopic simulation, uniaxial compression, failure mode, macro-porosity, crack growth

CLC Number:

TU528

HUANG Sheng, SUN Jiangtao, LI Zhitang, ZHU Zilong, SHEN Weiguo, SUN Zhijun, TAN Zonglin, WANG Guiming. Mesoscopic Simulation Study on Uniaxial Compression of Distributing-Filling Coarse Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2437-2446.

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