3D Numerical Simulation-based Study on Uniaxial Compressive Failure Mechanism of Manufactured Sand Self-compacting Lightweight Aggregate Concrete
ZHANG Shuyun1,*, ZHANG Qianqian1, ZHENG Suqin2, DAI Huijuan1
1 School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China 2 Xi'an JZFZ Architectural Design Co., Ltd., Xi'an 710061, China
Abstract: This study investigates the structural degradation mechanisms of manufactured sand self-compacting lightweight aggregate concrete (MS-SCLC) through meso-scale numericalsimulations. The composite system was conceptualized as a three-phase structure consisting of lightweight aggregates, mortar matrix, and interfacial transition zone (ITZ). A three-dimensional random aggregate model was developed using a plastic damage constitutive relationship, enabling systematic investigation of damage propagation patterns and mechanical behavior under uniaxial compression. Numerical simulations were performed to quantify both spatial damage distribution characteristics and macroscopic stress-strain responses during compressive loading. The results show that the difference between the simulated value and the experimental value of the compressive strength of the MS-SCLC40 cube is 1.14%, and the overall failure model is similar, indicating that the three-dimensional model is reaso-nable. Uniaxial compression simulations were performed on three-dimensional prismatic specimens of MS-SCLC, revealing near-overlapping stress-strain curves between numerical and experimental results. The simulated peak stress exhibited a marginal deviation of 2.15%, while the elastic modulus demonstrated a 2.49% discrepancy compared to experimental measurements, thereby further validating the efficacy of the proposed meso-scale modeling framework. The failure of MS-SCLC starts from the middle lightweight aggregate and extends to the edge. When the peak stress is 80%, the mortar matrix has a 45° crack. After the interface failure, the aggregate penetrates obliquely and finally forms an oblique macroscopic crack. The pressurized damage mechanism of MS-SCLC was revealed.
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2026, Vol. 40 
