Modeling of Irregular Recycled Aggregates and Numerical Simulation of Recycled Aggregate Concrete

Abstract

Abstract: Traditional recycled aggregate concrete (RAC) models mostly use basic geometries to represent recycled aggregate (RA) structures, which is quite different from the actual situation. In this paper, a real two-dimensional aggregate database was constructed by combining digital image technology and Fourier descriptor method, and a new method for random generation of RA based on aggregate overlap method was proposed. A new rapid placement algorithm suitable for Fourier reconstituted aggregate was proposed based on the coarse determination of the outer rectangular box/inscribed circle and the fine determination based on the overlap box. And the construction of RAC meso-structure with different RA substitution rates and RA residual mortar content was realized. Based on the cohesive zone model, a numerical model was established based on the meso-structure of randomly generated RAC, and the effects of RA substitution rate and RA residual mortar content on the uniaxial tensile performance of RAC were studied. The results show that the tensile strength and elastic modulus of RAC decrease with the increase of RA substitution rate and RA residual mortar content, but the peak strain does not change much. The RA model is more realistic, and the content and distribution of adhesion mortar can be adjusted independently.

Key words: Fourier reconstruction, recycled aggregate, recycled aggregate concrete, meso-structure, aggregate placement algorithm, cohesive zone model

CLC Number:

TU528.09

HU Yanbo, GAO Peng, LI Jingzhe, ZHANG Guohui, WANG Guotao, DONG Shuaizhi, CHU Yuting, ZHAN Binggen, YU Qijun. Modeling of Irregular Recycled Aggregates and Numerical Simulation of Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 276-286.

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