The Modeling Methods of Irregular Recycled Aggregates and Their Impact on the Compressive Strength of Concrete
FU Yu1, GAO Peng1,2,3, ZHAN Binggen1, 2,3,*, LI Jingzhe1, HU Yanbo1, YU Qijun1,2,3
1 School of Civil and Engineering, Hefei University of Technology, Hefei 230009, China 2 Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei 230009, China 3 Engineering Research Center of Low-carbon Technology and Equipment for Cement-based Materials, Ministry of Education, Hefei 230009, China
Abstract: To account for the shape of recycled aggregates (RAs) and to thoroughly investigate the influence of key RA parameters on the compressive performance of recycled aggregate concrete (RAC), thiswork aims to promote the high-value utilization of RAs. A Shape Overlay Method and a corresponding random placement algorithm was proposed to achieve parametric modeling of RAC mesostructures incorporating RAs with realistic shapes. Based on the "mapped mesh method" and a cohesive zone model, a numerical model for RAC was established and calibrated by existing experimental data. The effects of key parameters, such as RA replacement ratio, residual mortar content, new-to-old mortar strength ratio, and porosity, on the mechanical response and fracture process of RAC under compressive loading were investigated. The results indicate that, without considering the additional reduction in water-cement ratio due to the high-water absorption of RAs, the compressive strength of RAC decreases as the increase of RA replacement ratio, new-to-old mortar strength ratio, residual mortar content, and porosity with a maxium reduction of up to 15%—20%. This is mainly attributed to the role of the old interface of RAs and initial voids in guiding crack propagation.
付宇, 高鹏, 詹炳根, 李景哲, 胡焱博, 余其俊. 非规则再生骨料建模方法及其对混凝土抗压性能的影响[J]. 材料导报, 2025, 39(20): 24100247-9.
FU Yu, GAO Peng, ZHAN Binggen, LI Jingzhe, HU Yanbo, YU Qijun. The Modeling Methods of Irregular Recycled Aggregates and Their Impact on the Compressive Strength of Concrete. Materials Reports, 2025, 39(20): 24100247-9.
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2025, Vol. 39 
