外粘碳纤维布加固混凝土的粘接性能研究

Study on bonding performance of externally bonded carbon fiber cloth reinforced concrete

为了提升外粘碳纤维布加固混凝土的粘接性能,对比分析了未掺加钢纤维和掺加不同含量钢纤维的外粘碳纤维布加固混凝土的粘接性能。结果表明,掺加钢纤维可以提升混凝土试件的抗压强度、劈拉强度、极限荷载、峰值扰度和最大应变,从而对混凝土起到加固作用;掺加钢纤维试件的极限荷载要高于未掺加钢纤维的试件,且钢纤维掺加量越大则极限荷载越大,界面滑移也越大;都使用再生骨料混凝土的情况下,掺加钢纤维试件的有效粘接长度大于未掺加钢纤维的试件,且当钢纤维掺加量较大时试件有效粘接长度要高于未使用再生粗骨料的试件。

In order to improve the bonding performance of externally bonded carbon fiber cloth reinforced concrete,the bonding performance of externally bonded carbon fiber cloth reinforced concrete with and without steel fiber addition and with different content of steel fibers was compared and analyzed.The results showed that the addition of steel fiber can improve the compressive strength,splitting tensile strength,ultimate load,peak disturbance and maximum strain of concrete specimens,thus playing a reinforcing role for concrete.The ultimate load of concrete specimens strengthened with steel fibers was higher than that of concrete specimens without steel fibers,and the greater the amount of steel fibers,the greater the ultimate load and the interface slip.When recycled aggregate concrete was used,the effective bonding length of the specimens with steel fiber was greater than that of the specimens without steel fiber,and when the amount of steel fiber was large,the effective bonding length of the concrete specimens was higher than that of the concrete specimens without using recycled coarse aggregate.