粗骨料力学特性对混凝土性能影响的数值试验研究

Numerical study on the effect of mechanical properties of coarse aggregate on concrete performance

粗骨料的力学特性对混凝土宏观力学性能有着显著的影响,从细观角度,利用数值试验研究含不同力学特性粗骨料混凝土试件的力学性能和破坏特点,分析了不同类型粗骨料混凝土试件破坏时的力学特性,破裂机理和声发射特征。研究结果表明,粗骨料的力学特性在一定程度上影响混凝土材料的力学性能,粗骨料的强度和弹性模量的增加有助于提高混凝土的抗压强度,但混凝土力学性能的提高受其内部各组分参数的综合影响。粗骨料的弹性模量与混凝土基质间的变形协调是提高混凝土性能需要考虑的因素之一。

The mechanical properties of coarse aggregate have a significant effect on the macroscopic mechanical properties of concrete. The mechanical properties and failure characteristics of concrete specimens with different coarse aggregate were studied by numerical simulations. The mechanical properties,fracture mechanism and acoustic emission of concrete specimens with different coarse aggregate were analyzed. Results show that the mechanical properties of coarse aggregate affect the mechanical properties of concrete materials. The increase of strength and elastic modulus of coarse aggregates can improve the compressive strength of concrete,however,the combined effects is other import factor that influence the performance of concrete. The coordination of the elastic modulus of the coarse aggregate with the deformation of the concrete matrix is one of the factors that need to be considered to improve the performance of the concrete.