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新老混凝土良好结合是混凝土修补成功的关键,提出设置界面构造锚筋来增强新老混凝土粘结性能,通过采用劈拉试验和剪切试验综合分析有无构造锚筋的新老混凝土试件以及新、老混凝土整体试件的劈拉强度与抗剪强度特性。试验结果表明:无界面构造锚筋时新老混凝土水平粘结面试件的劈拉强度高于具有竖直粘结面的试件;采用构造锚筋的新老混凝土试件比不加锚筋试件的劈拉强度增长了24.1%;采用锚筋的新老混凝土试件的剪切破坏面均发生在结合面处,且试件两个结合面的剪切破坏不是同时产生;采用锚筋试件的剪切强度为无锚筋试件剪切强度的3.49倍,为新混凝土整体剪切试件强度的115.5%;构造锚筋能明显增强新老混凝土粘结性能。
The good combination of old and new concrete is the key to the success of concrete repairing. It is proposed to set the interface to construct the anchorage bar to enhance the bonding performance of new and old concrete. By using the splitting tensile test and shear test, Splitting strength and shear strength of new and old concrete specimens. The test results show that the splitting tensile strength of the new and old concrete horizontal bonded specimens is higher than that of the specimens with vertical bonded surface without the anchoring ribs in the interface structure. The splitting tensile strength of the pieces increased by 24.1%; the shear failure surfaces of the new and old concrete specimens with anchor bars occurred at the joint surface, and the shear failure of the two joining surfaces of the specimens did not occur at the same time; The shear strength of the specimens is 3.49 times of the shear strength of the specimens without anchors, which is 115.5% of the shear strength of the specimens of the whole new concrete. The anchorage tendons can obviously enhance the bonding properties of the new and old concrete.