含砖粒再生粗骨料混凝土损伤性能试验研究

用废弃砖部分取代废弃混凝土(取代率r=0%、10%、20%、30%)作为再生粗骨料制成再生混凝土。采用超声波检测再生混凝土的损伤,以超声波波速的衰减来衡量损伤,对单轴受压持荷状态下再生混凝土试件进行超声试验。通过试验研究,得出不同废弃砖取代率下单轴压应力系数对再生混凝土损伤的影响规律。试验结果表明废弃砖粗骨料取代率对单轴受压条件下再生混凝土的损伤影响很大。针对再生混凝土损伤的主要影响因素—单轴压应力系数,建立了含砖粒再生粗骨料混凝土的损伤关系模型。

Experimental study on damage behavior of recycled coarse aggregate concrete containing brick

In this paper,the recycled coarse aggregate was prepared from waste concrete and brick,in which the waste concrete coarse aggregate was substitute for waste brick aggregate with 0%,10%,15% and 30%. The damage of recycled concrete was detected by ultrasonic wave,and it was measured by the decay of the ultrasonic wave velocity. The ultrasonic experiment was carried out on the recycled concrete specimen under uniaxial compression load condition. The effect of uniaxial compressive stress on the damage of recycled concrete under different replacement rates of waste bricks was obtained through experiments. The results present that the replacement rate of waste bricks has a great effect on the damage of recycled concrete under uniaxial compression. Finally,for the uniaxial compressive stress coefficient,which is the main factor affecting the damage of recycled concrete,the damage relation model of recycled coarse aggregate concrete containing brick is established.