新老混凝土粘结收缩性能研究

Study of shrinkage performance of adherence of young on old concrete

通过新老混凝土粘结试件的试验研究与理论分析 ,提出了约束收缩的力学模型 ;可以计算出粘结界面处的约束力以及粘结试件横截面的应力分布 ,二者随时间增长而增长 ,到新混凝土收缩停止时达到最大 ;

Through test and analysis on the bonding specimens of young concrete on old concrete, the mechanics model is given. The model can calculate the restrained force on the bonding interface and the stresses distribution on the transverse section. The force and stress increase with the time grows, and reach the maximum values when the shrinkage of the new concrete finishes. The distribution of strains on the section of the bonding specimen conforms the hyperbolic shape.