硫酸盐侵蚀冻融循环下聚乙烯醇纤维钢筋混凝土的黏结性能试验研究

为了研究硫酸盐侵蚀冻融循环下聚乙烯醇(PVA)纤维钢筋混凝土的粘结滑移性能，对4种掺不同体积百分比PVA纤维混凝土进行不同次数的硫酸盐浸泡下的冻融循环实验。实验结果表明，在一定范围内，随着PVA纤维掺量的增高可以提高混凝土的抗压强度；PVA纤维可以一定程度上阻止硫酸盐对混凝土的侵入，在硫酸盐冻融初期可以增强混凝土的抗压强度；在混凝土中添加一定量百分比体积的PVA纤维可以增加钢筋混凝土粘结的峰值滑移，增加了混凝土的塑性应变，硫酸盐冻融次数的增加会减少钢筋在混凝土中的峰值滑移。

Experimental Study on Bonding Properties of Polyvinyl Alcohol Fiber Reinforced Concrete under Sulfate Corrosion Freeze-Thaw Cycling

In order to study the bond slip constitutive relationship of PVA fiber reinforced concrete under sulfate freeze-thaw cycles, four types of concrete mixed with different volume percentages of PVA fiber were subjected to different times of sulfate immersion freeze-thaw cycles. The experimental results show that, within a certain range, the compressive strength of concrete can be improved with the increase of PVA fiber content; PVA fiber can prevent sulfate intrusion into concrete to a certain extent, and can enhance the compressive strength of concrete at the initial stage of sulfate freezing and thawing; Adding a certain percentage volume of PVA fibers to concrete can increase the peak slip of bond between reinforced concrete and increase the plastic strain of concrete. Increasing the number of sulfate freeze-thaw cycles will reduce the peak slip of reinforcement in concrete.