石粉人工砂再生混凝土轴压性能试验研究

Experimental study of axial compression properties recycled concrete with artificial sand containing stone powder

为了研究石粉人工砂再生混凝土的轴压力学性能,进行了45个标准棱柱体试件的轴心受压试验,获取了试件的应力-应变全过程曲线,分析了石粉含量对不同强度等级石粉人工砂再生混凝土的轴压性能影响规律,基于试验数据拟合得到了相应的应力-应变本构方程。研究结果表明:随着石粉含量的增加,抗压强度先增大后减小,峰值应变、变形系数及耗能系数呈下降趋势;低强度等级试件的损伤发生早于高强度等级的试件,而高强度等级试件的损伤发展速度相对更快;所提出的轴压应力-应变本构方程计算结果与试验结果吻合较好。

To investigate the axial compression properties of recycled concrete with artificial sand containing stone powder(RCASSP),axial compression tests on 45 standard prismatic specimens were carried out.The stress-strain curves of the specimens were obtained,the influence of stone powder content on the axial compression properties of RCASSP with different concrete strength grades were analyzed,and the stress-strain constitutive equations of RCASSP were fitted based on the test data.The results show that with the increase of stone powder content,the peak stress increases first and then decreases,the peak strain,deformation coefficient and energy dissipation coefficient show a decreasing trend.Damage to low strength grade specimens occurs earlier than to high strength grade specimens,while damage to high strength grade specimens develops relatively more rapidly.The constitutive equations of RCASSP are consistent with experimental results.