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为了研究骨料类型对再生混凝土力学性能的影响,以再生粗骨料种类和取代率为变化参数,设计了198个再生混凝土试块,分别进行了立方体抗压强度、棱柱体抗压强度、抗折强度、弹性模量、泊松比等力学性能试验,获取了试件受力破坏全过程的应力-应变曲线以及峰值应力、峰值应变、弹性模量、泊松比等特征参数。基于试验数据,从位移延性、能量耗散、损伤过程、本构关系等方面分析了骨料类型对其破坏机理和力学性能的影响。试验结果表明:再生卵石混凝土的延性系数与耗能系数均值都比再生碎石混凝土大5%,前者的力学性能指标略好,变形性能更优,损伤过程也更为缓慢,而骨料类型对再生混凝土的能量耗散能力无明显影响。最后提出了不同骨料类型再生混凝土应力-应变本构方程,研究结果可供再生混凝土的进一步科学研究和工程应用提供参考。
In order to study the effect of aggregate types on the mechanical properties of recycled concrete, 198 recycled concrete test blocks were designed according to the types and replacement rates of recycled coarse aggregates. The compressive strength of cubes, compressive strength of prism, Flexural strength, elastic modulus, Poisson’s ratio and other mechanical property tests, the stress-strain curves and the peak stress, peak strain, elastic modulus, Poisson’s ratio and other characteristic parameters were obtained. Based on the experimental data, the influences of aggregate types on the failure mechanism and mechanical properties were analyzed from the aspects of displacement ductility, energy dissipation, damage process and constitutive relations. The results show that the average ductility and energy dissipation coefficient of recycled pebble concrete is 5% higher than that of recycled aggregate concrete. The former has a slightly better mechanical property index, better deformation performance and slower damage process, while the aggregate type The energy dissipation capacity of recycled concrete had no significant effect. Finally, the stress-strain constitutive equations of recycled aggregate concrete with different aggregate types are put forward. The research results can provide reference for further scientific research and engineering application of recycled concrete.