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吉林西部地区处于严寒地区,混凝土建筑物会因冻融的影响而导致混凝土结构过早地失去原有的性能,因此,通过对冻融循环作用下钢筋与混凝土黏结应力的损伤进行了试验研究。试验用钢筋混凝土试件的混凝土强度等级为C30,配制普通混凝土与引气混凝土试件进行对比,在钢筋混凝土试件经受了0,25,50次冻融循环作用后,利用电子万能试验机进行拉拔试验,测量其钢筋与混凝土之间的黏结应力,总结出冻融循环作用次数、混凝土配合比对钢筋与混凝土黏结应力的影响规律。结果表明,冻融循环作用次数的增加会导致钢筋与混凝土之间的黏结应力降低;在冻融循环作用下引气混凝土试件的钢筋与混凝土黏结应力的损伤比普通混凝土试件明显降低,抗冻性更好。
The western part of Jilin is in a severely cold area. Due to the influence of freeze-thaw, the concrete structure will lose its original performance prematurely. Therefore, the damage of the bond between steel and concrete under freeze-thaw cycles has been studied experimentally. The concrete strength grade of the test reinforced concrete specimens is C30. The comparison between the normal concrete and the air-entrained concrete specimens was performed. After the reinforced concrete specimens were subjected to 0, 25, and 50 freeze-thaw cycles, an electronic universal testing machine was used. The pull-out test measures the bond stress between the steel reinforcement and the concrete, and summarizes the influence of the number of freeze-thaw cycles and the effect of the concrete mix ratio on the bond stress between the reinforcement and the concrete. The results show that the increase in the number of freeze-thaw cycles will lead to a decrease in the bond stress between the steel bars and the concrete; the damage of the bond stress between the steel bars and the concrete of air-entrained concrete specimens under freezing and thawing cycles is significantly lower than that of ordinary concrete samples. Better frozen.