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 compres-sive strength of concrete at the initial stage of sulfate freezing and thawing.Adding a certain percentage volume of PVA fibers to con-crete 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.
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