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为了研究再生混凝土在多应力状态下的变形行为,设计68个圆柱体试件对再生混凝土的取代率、侧向压力、混凝土的龄期,混凝土的强度进行了三向受力试验。试验给出了试件破坏全过程的应力-应变曲线,并深入分析了三轴受压再生混凝土的初始弹性模量、峰值应变、位移延性、能量耗散、损伤演变等性能参数。研究结果表明:龄期、侧向压力越大以及混凝土强度越高,再生混凝土的弹性模量越大;侧向压力可有效提高再生混凝土的变形性能;取代率对延性性能有一定的影响,但对耗能能力影响不大;龄期越大,再生混凝土强度越低,再生骨料服役年限越短,其延性性能和耗能性能越好;侧向压力越大,损伤曲线斜率越小,表明再生混凝土的损伤时间推迟,再生混凝土的损伤受取代率的影响不大。
In order to study the deformation behavior of recycled concrete under multi-stress conditions, 68 cylinder specimens were designed to test the three-dimensional force test of the replacement ratio, lateral pressure, concrete age and concrete strength of recycled concrete. The stress-strain curves of the whole process of specimen failure are given. The initial elastic modulus, peak strain, displacement ductility, energy dissipation and damage evolution of the three-axis compression-reclaimed concrete are deeply analyzed. The results show that the elastic modulus of recycled concrete increases with the increase of age and lateral pressure and the strength of concrete. The lateral pressure can effectively improve the deformation performance of recycled concrete. The substitution rate has certain influence on the ductility, Which has little effect on energy consumption. The larger the age, the lower the strength of recycled concrete, the shorter the service life of recycled aggregate, the better the ductility and energy dissipation performance. The larger the lateral pressure, the smaller the slope of damage curve The damage time of recycled concrete is delayed, and the damage of recycled concrete is not affected by the substitution rate.