单轴受压下再生混凝土的损伤特性研究

摘要

In order to investigate the effect of uniaxial compressive stress on the damage of recycled concrete, real - time ultrasound tests were carried on recycled concrete with different recycled aggregate replacement ratio by using ultrasonic detecting technology. The rule of axial compressive damage altered with uniaxial compressive stress was studied by the uniaxial compression tests and real - time ultrasound tests of recycled concrete with different recycled aggregate replacement ratio. The results show that recycled aggregate replacement ratio has remarkable effect on the damage of recycled concrete , and the axial compressive damage of recycled concrete can not be ignored before load get at ultimate compressive stress. Based on the test results, a damage relational model of recycled concrete is established under considering the effect of uniaxial compressive stress and the initial compressive strength of recycled concrete at different recycled aggregate replacement ratio.%利用超声检测技术,以超声波波速的衰减来度量损伤,对单轴受压条件下不同再生粗骨料取代率再生混凝土的损伤进行实时超声试验.通过试验研究了不同再生粗骨料取代率下再生混凝土损伤随单轴压应力的变化规律.结果表明再生粗骨料取代率对单轴压应力下混凝土损伤影响显著,且不应忽视混凝土在极限压应力以前的损伤.在考虑单轴压应力、再生混凝土初始强度影响因素下,建立了再生混凝土损伤关系模型.