中文摘要：

以自密实混凝土（SCC）为新混凝土材料,设计了推出式剪切试验装置,进行了新老混凝土粘结面的单剪试验,研究了不同强度的自密实混凝土与老混凝土的粘结滑移关系;加载后测得沿粘结长度上新混凝土在粘结面处局部的应变,再结合应变与粘结应力的分布,可以得到新老混凝土局部的粘结滑移曲线。试验结果表明：粘结应力分布呈三段式曲线;在自由端处曲线斜率很小,而在加载端处应力与滑移都增长较快;通过回归分析,得到了局部粘结滑移的本构关系,可为工程设计提供参考。

英文摘要：

With the self-compacting concrete as new concrete,the shear experiment of new and old concrete is conducted by the push-out shear test in order to study the bond-slip relationship between the self-compacting concrete（different strength） and old concrete.After loading,the strain of new concrete is measured along the bonding length.With the distribution of strain and stress in concrete,the part bond stress-slip curves of new or old concrete are deduced.The results show that the curves of bonding strength are developed with three stages.The slope of the curves is minor near the free side.The stress and slip of load side also increase faster than that of the other sides.Based on the regression analysis,the constitutive relation of part bond stress-slip is suggested.It can be taken as the reference to the structural design.2 tabs,6 figs,10 refs.