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通过电化学加速锈蚀、钢筋和UHTCC直接拉拔试验对不同锈蚀率(0,1%,2%,3%和5%)下钢筋与UHTCC的粘结性能进行了研究,并与同条件下的混凝土试件进行对比。通过直接拉拔实验得到不同锈蚀率时平均粘结应力与滑移量的关系,采用粘结滑移的连续模型进行拟合,模型值与实验值吻合较好。与混凝土试件锈蚀率超过2%后最大平均粘结应力迅速下降现象不同,UHTCC能充分发挥其对钢筋的约束作用,在锈蚀率小于3%范围内,最大平均粘结应力随锈蚀率增大线性增加,锈蚀率超过3%直到5%基本维持不变,保持较好的粘结性能。
The adhesion between steel bar and UHTCC at different corrosion rates (0, 1%, 2%, 3% and 5%) was investigated by galvanic corrosion acceleration, direct tensile test with steel bar and UHTCC, Concrete specimens for comparison. The relationship between the average bond stress and slippage at different corrosion rates was obtained by direct drawing experiments. The model was fitted by the continuous slip bond model, and the model values were in good agreement with the experimental values. Different from the rapid decrease of the maximum average bond stress when the corrosion rate of concrete specimens is more than 2%, UHTCC can fully exert its restraining effect on the steel bars. When the corrosion rate is less than 3%, the maximum average bond stress increases with the corrosion rate Linear increase, the corrosion rate of more than 3% until 5% remained unchanged, to maintain good bonding performance.