锈胀开裂后变形钢筋与混凝土粘结性能实验研究

Experimental Research on Bond Property between Corroded Deformed Reinforcement and Concrete

为研究锈胀开裂对变形钢筋与混凝土间粘结性能的影响,开展了电化学快速锈蚀内贴应变片钢筋混凝土试件的拔出实验,得到了不同位置处钢筋的应变,进而推导了钢筋与混凝土不同位置处的粘结应力,分析了锈胀裂缝宽度对钢筋与混凝土间不同位置处粘结应力的影响。实验研究表明:粘结试件中的钢筋应变对锈胀裂缝宽度的敏感性大;对于锈胀裂缝较小的试件,其粘结应力峰值接近加载端,而对于锈胀裂缝较大的试件,粘结应力峰值更靠近自由端。

In order to study the effect of crack induced by corrosion on the bond property between reinforcement and concrete, pullout tests for bonding specimens with deformed reinforcing bar and interiorly adhibited strain gauge were carried out. The test specimens were produced by accelerated corrosion. Different reinforcement strains were obtained, therefore the bond stresses between reinforcement and concrete were derived. The effect of corrosion cracks on bond stress between the reinforcement and concrete was analyzed. Experimental results show that the sensitivity of reinforcement strain on corrosion crack width is significant; for specimens with narrow crack, peak bond stress mainly appears near the loading end; for specimens with wide crack, peak bond stress is close to the free end.