再生混凝土常规三轴受压性能试验研究

Experimental study on compressive performance of recycled aggregate concrete subject to conventional tri-axial compression

进行了12个再生混凝土试件常规三轴受压试验考察围压值和取代率对再生混凝土破坏形态、应力-应变曲线、力学性能指标的影响。研究结果表明:常规三轴受压状态下,再生混凝土均为剪切破坏,破坏时有较明显的脆性;再生混凝土的峰值应力、峰值应变、弹性模量随围压值增大而显著提高但受取代率的影响不大;增大围压值能有效提高再生混凝土的延性性能和耗能能力。

12 recycled concrete specimens were designed for triaxial test,and lateral confinement and replacement ratio were taken into consideration as the major parameters in the test.The failure patterns and the stress- strain curves of the specimens,as well as the mechanical performance index were obtained.The experimental results indicates that the failure pattern of recycled concrete is shear failure pattern,and its damage brittleness obviously.Increase the lateral compression value can be effectively improved the strength,peak strain elastic modulus.ductility performance and energy dissipation capacity of the high strength recycled coarse aggregate concrete.Replacement ratios have little impact on mechanical performance index of recycled concrete.