论文部分内容阅读
为研究钢筋与再生混凝土黏结滑移性能,进行了13个梁式试件的钢筋-中高强度再生混凝土黏结性能试验。研究了钢筋外形、锚固长度、混凝土强度、再生骨料取代率对钢筋-再生混凝土黏结滑移性能的影响。结果表明:再生粗骨料混凝土取代率为33%~66%、细骨料为天然砂时,钢筋-再生混凝土黏结强度与普通混凝土接近;再生粗骨料取代率100%、再生细骨料取代率50%以上时,钢筋-再生混凝土黏结性能明显退化;与普通混凝土相比,再生粗骨料混凝土的相对混凝土强度黏结效率系数有所提高;变形钢筋与再生混凝土的黏结强度明显好于光圆钢筋;钢筋与再生混凝土的黏结强度随钢筋相对锚固长度增大而减小;拟合所得的黏结-滑移本构模型,其计算值与试验值吻合良好。
In order to study the bond slippage between rebar and recycled concrete, the bond behavior of 13 steel bars with medium-high strength recycled concrete was tested. The effects of reinforcement profile, anchorage length, concrete strength and recycled aggregate substitution on the bond-slip properties of reinforced concrete-recycled concrete were studied. The results show that the replacement ratio of recycled coarse aggregate concrete is 33% ~ 66%, the fine aggregate is natural sand, the bond strength between rebar and recycled concrete is similar to ordinary concrete; the replacement rate of recycled coarse aggregate is 100% Compared with ordinary concrete, the coefficient of cohesion efficiency of recycled coarse aggregate concrete is higher than that of ordinary concrete; the bond strength between deformed steel and recycled concrete is obviously better than that of plain The bond strength between rebar and recycled concrete decreases with the increase of the relative anchorage length of the rebar. The calculated bond-slip constitutive model fits well with the experimental values.