自密实混凝土与老混凝土黏结滑移试验研究

Experimental Research of Bond-slip Relationship on Adhesion of Self-competing Concrete on Existing Concrete

以自密实混凝土(SCC)作为新混凝土材料,进行了老混凝土刻槽下的黏结滑移试验研究,研究纯剪状态下新老混凝土黏结面黏结滑移曲线.试验结果表明,黏结滑移面滑移可分为弹性变形、弹塑性变形以及塑性破坏三个阶段.在相同条件下,刻槽密度越大,试件的黏结性能越好.利用四次多项式对试验曲线进行拟合,建议适合于自密实混凝土与老混凝土黏结面应力-应变关系的数学模型.

With the self- compacting concrete （SCC） taken as the new concrete, the experimental research on direct shear behavior of adhesion between existing and new concrete are performed. The study on the Bond - slip curves between existing and new concrete. The experimental results show that the Bond - Slip curves can be divided into three stages： the elastic deformation, elastic - plastic deformation and plastic failure. Increase the bonding area can improve the bond behavior under the same reaction conditions. The Bond- slip curve of self- compacting concrete and old concrete was fitted utilizing quartic polynomial. Mathematical expression for shear stress - strain curve of self - compacting concrete was regressed.