1. Improve high temperature stability, improve high temperature stability Due to the three-dimensional distribution of polyester fiber monofilament, and at the same time have strong adsorption with asphalt, and do not entangle, can adsorb too much free asphalt, so that the viscosity and cohesion of asphalt increase, at the same time, due to the crisscrossing reinforcement and bridging effect, the flow performance of asphalt is reduced, the lateral displacement or flow of aggregates is limited, the high temperature stability is effectively improved, and the stability of fiber asphalt concrete is greatly improved.
2. Improve the low-temperature crack resistance, the adsorption effect of fiber on asphalt, resulting in an increase in the optimal amount of asphalt in asphalt concrete, higher asphalt content, so that the fiber asphalt mixture still maintains flexibility and high tensile strength at a low temperature of -40 °C, effectively resists shrinkage stress, enhances the low-temperature crack resistance of the mixture, reduces the generation of temperature shrinkage cracks and can prevent the development of reflective cracks.
3. Improve fatigue resistance asphalt pavement under the action of external temperature environment, subjected to the repeated action of wheel load, when the load repeated action exceeds a certain number of times, the stress generated in the pavement under the load will exceed the structural resistance of the strength decrease, so that cracks appear on the pavement, resulting in fatigue fracture damage, after adding polyester fiber, the uniform distribution of fiber monofilament in the mixture of reinforcement, so that its stiffness modulus increases, improve the fatigue resistance of asphalt concrete.
4. Improve water stability: The water stability of asphalt pavement refers to the repeated action of asphalt pavement under the condition of water presence, subject to traffic load and temperature rise and contraction. The addition of polyester fiber thickens the asphalt film, reduces the strength of water replacement asphalt, and reduces the amount of water infiltrating into asphalt concrete, coupled with the adsorption of fiber, the viscosity of asphalt becomes larger, improves the bonding force between asphalt and aggregate, strengthens the ability of the interface film formed by asphalt and aggregate in asphalt mixture to resist water peeling, thereby improving the water stability of asphalt mixture.