再生混凝土轴心受拉性能试验与格构数值模拟

通过轴心受拉试验获取再生混凝土各相材料(老硬化砂浆、新硬化砂浆、界面过渡区)的力学参数,并研究再生混凝土在轴心受拉状态下的破坏机理.基于固体力学相关知识,结合再生混凝土各相材料的力学性能,建立一种再生混凝土细观格构模型.根据试验获得的再生混凝土各相材料力学参数,通过格构模型对再生混凝土进行轴心受拉模拟分析,获取再生混凝土轴心受拉应力-应变曲线,并探讨再生混凝土的内部破坏过程和轴心受拉破坏机理.结果表明,再生混凝土的受拉断裂部位主要集中在新或老硬化砂浆处,针对再生混凝土受拉力学性能,格构模型的模拟分析与轴心受拉试验结果基本吻合.

The tensile test and lattice model simulation on recycled concrete

The mechanical parameters of each phase of recycled concrete such as old hardened mortar, the new hardened mortar, interfacial transition zone (ITZ) were obtained by axial tension tests, and the failure mechanism of recycled concrete under axial tensile loading was studied. Based on the relevant knowledge of solid mechanics and mechanical properties of each phase of recycled concrete, a new meso-level lattice model of recycled concrete was proposed. According to the material parameters of each phase of recycled concrete, lattice model simulation on the failure mechanisms of the recycled concrete under axial tension was carried out by the lattice model, the axial tensile stress-strain relationship curves for recycled concrete were attained, and the internal damage process and tensile failure mechanism of recycled concrete were discussed. The results showed that the tensile fracture occurred approximately in the old or new hardened mortar, and the results of lattice model simulation were consistent with those of axial tensile tests.