自密实再生混凝土与带肋钢筋间的黏结性能

Bond performance between self-compacting recycled concrete and ribbed steel bar

为研究自密实再生混凝土(RASCC)与带肋钢筋的黏结性能,设计了18组试件,通过中心拉拔试验研究混凝土强度、钢筋直径、黏结长度和保护层厚度对黏结性能的影响。研究表明:RASCC与带肋钢筋的黏结强度随混凝土抗压强度呈指数型增长,随劈拉强度呈线性增长,随钢筋直径和黏结长度均呈抛物线型增长,随保护层厚度的增加呈先增大后稳定的趋势。基于试验结果,提出了RASCC与带肋钢筋的黏结强度和临界锚固长度计算公式,建立了RASCC与带肋钢筋的黏结-滑移本构模型。

To study the bond performance between self-compacting recycled concrete(RASCC) and ribbed steel bar,18 sets of specimens were designed,and the effects of concrete strength,steel bar diameter,bond length and protective layer thickness on bond performance were studied by central pull-out test.The results show that the bond strength between RASCC and ribbed steel bar increases exponentially with the compressive strength of concrete,increases linearly with the splitting tensile strength,increases parabolically with the diameter and bond length of steel bar,and increases first and then stabilizes with the increase of protective layer thickness.According to the experimental results,the formulas for calculating the bond strength and critical anchorage length of RASCC and ribbed steel bar were proposed,and the bond-slip constitutive model of RASCC and ribbed steel bar was established.