钢筋-中高强度再生混凝土黏结滑移性能梁式试验研究

发布时间：2018-09-06 12:00

【摘要】：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。
[Abstract]:In order to study the adhesion and slip behavior of rebar and recycled concrete, 13 beam specimens were tested on the bond behavior of rebar and high strength recycled concrete. The effects of reinforcement shape, anchoring length, concrete strength and recycled aggregate replacement ratio on the bond slip properties of rebar and recycled concrete were studied. The results show that the ratio of replacement of recycled coarse aggregate concrete is 33%. When the fine aggregate is natural sand, the bond strength of rebar and recycled concrete is close to that of ordinary concrete, and when the replacement rate of recycled coarse aggregate is 100%, the replacement rate of recycled fine aggregate is more than 50%. Compared with ordinary concrete, the bond efficiency coefficient of recycled coarse aggregate concrete relative to concrete strength is improved, the bond strength of deformed steel bar and recycled concrete is obviously better than that of plain reinforced bar. The bond strength between rebar and recycled concrete decreases with the increase of the relative Anchorage length of the steel bar, and the calculated values of the fitted bond-slip constitutive model are in good agreement with the experimental values.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;北京工业大学北京城市交通协同创新中心;
【基金】：国家自然科学基金重点项目(51438007)
【分类号】：TU528

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