The Main Role Of Polyester Fibers in Asphalt Concrete

  1.Improving high-temperature stability: The three-dimensional distribution and strong adsorption performance of polyester fibers enable them to adsorb a large amount of free asphalt, increasing the viscosity and cohesion of asphalt. At the same time, fibers form longitudinal and transverse reinforcement and bridging effects in concrete, limiting the fluidity of asphalt, preventing lateral displacement or flow of aggregates, effectively improving high-temperature stability, making fiber reinforced asphalt concrete more resistant to high-temperature deformation, and improving the stability of the road surface.
  2.Improving low-temperature crack resistance: The strong adsorption of polyester fibers on asphalt leads to an increase in the optimal asphalt dosage, resulting in a higher asphalt content in the fiber asphalt mixture. This allows the mixture to maintain flexibility and high tensile strength at low temperatures (-40 ℃), effectively resisting shrinkage stress, enhancing the low-temperature crack resistance of the mixture, and reducing the generation of temperature induced cracks and reflective cracks. Improved the low-temperature crack resistance performance of asphalt concrete.
  3.Improving fatigue resistance: Under the repeated effects of external temperature environment and wheel loads, asphalt pavement will experience fatigue fracture failure. The addition of polyester fibers can evenly distribute in the mixture and play a reinforcing role, improving the stiffness modulus of concrete, thereby improving the fatigue resistance of asphalt concrete and slowing down the fatigue fracture damage of the road surface.
  4.Improving water stability: The water stability of asphalt pavement refers to the repeated effects of traffic loads and temperature fluctuations in the presence of water. The addition of polyester fibers thickens the asphalt film and reduces the displacement effect of moisture on the asphalt. At the same time, the adsorption of fiber increases the viscosity of asphalt, improves the bonding force between asphalt and aggregate, and enhances the ability of the interface film formed between asphalt and aggregate in asphalt mixture to resist water stripping, thus improving the water stability of asphalt mixture.