关键词: 断裂性能, 原级配混凝土, 湿筛混凝土, 细观分析, Monte Carlo模拟

Abstract: In order to study the effect of aggregate content on the mechanical properties of concrete before and after wet screening, the fracture process between original-graded and wet screen concrete under uniaxial tension was simulated by meso-finite element method. The variation of tensile fracture properties between original gradation and wet screen concrete was analyzed when the original aggregate content was 40%, 45% and 50%, respectively. In this process, Monte Carlo simulation method was used to eliminate the influence of randomness of concrete meso-structure. The results showed that when the aggregate content increases gradually, the difference of mechanical properties between the original graded concrete and wet screen concrete changes obviously, the ratio of elastic modulus increases correspondingly, the ratio of peak stress remains basically unchanged, and the ratio of peak strain and fracture energy tends to decrease.

Key words: fracturing behavior, original-graded concrete, wet-screened concrete, meso-structure analysis, Monte Carlo simulation