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通过聚丙烯纤维混凝土与冻害混凝土的黏结性能试验研究,主要考察了聚丙烯纤维掺量、界面剂类型及冻融循环作用等对聚丙烯纤维与冻害混凝土黏结性能的影响。试验结果表明,冻融循环作用对新混凝土与损伤混凝土黏结性能的损伤程度较大;聚丙烯纤维的加入明显提高了新混凝土与损伤混凝土的黏结劈拉强度及黏结面的抗冻融循环作用的能力;同时,界面剂类型对新混凝土与损伤混凝土的黏结强度有一定的影响,采用混凝土界面剂的试件的黏结劈拉强度及黏结面的抗冻融作用的能力高于采用水泥净浆的试件。
Through the experimental research on the bond properties between polypropylene fiber concrete and frozen concrete, the effects of polypropylene fiber content, interface agent type and freeze-thaw cycle on the bonding properties of polypropylene fiber and frozen concrete were investigated. The experimental results show that the freeze-thaw cycle has a greater damage on the bonding performance between the new concrete and the damaged concrete. The addition of polypropylene fiber obviously improves the splitting tensile strength of the new concrete and the damaged concrete and the freeze-thaw cycle of the bonded surface Ability of the interface agent at the same time, the type of the interface agent has a certain influence on the bond strength between the new concrete and the damaged concrete, the bond splitting tensile strength of the test specimen with the concrete interface agent and the freeze-thaw resistance of the bonding surface are higher than those of the cement paste Specimen.