Abstract: In order to study the influence of polyester fiber contents and freeze-thaw cycles, asphalt mixture specimens were mixed with polyester fiber whose contents were 0,0.1%,0.2%,0.3%.Asphalt mixture specimens were used to do freeze-thaw split tests.The results indicate that freeze-thaw split tensile strength of asphalt mixture ascended then descended with the increase of polyester fiber.Optimal content of polyester fiber is 0.2%.At the same time, when freeze-thaw cycles is 0 times and the content of polyester fiber are 0.1%,0.2%,0.3%, the freeze-thaw spilt tensile strength of asphalt mixture is increased by 19.8%,30.2%,13.4% compared with the strength of asphalt mixture without polyester fiber, and water stability is improved because of polyester fiber.When the content of polyester fiber is 0.2% and freeze-thaw cycles are 2,4,6,8 times, freeze-thaw split tensile strength ratios of asphalt mixture are 86.0%, 80.2%, 70.1%, 61.5%.Water stability of asphalt mixture is decreased with the increase of freeze-thaw cycles.

Key words: asphalt mixture;polyester fiber;freeze-thaw cycle;water stability