The main role of polyester fiber
1.Improve high-temperature stability and high-temperature stability. Because of the three-dimensional distribution of polyester fiber monofilament, it has strong adsorption with asphalt, and does not entangle. It can adsorb too much free asphalt, making the viscosity of asphalt. Increased cohesion and cohesion. At the same time, due to the crisscross reinforcement and bridging effect, the flow performance of the asphalt is reduced, the lateral displacement or flow of the aggregate is restricted, the high temperature stability is effectively improved, and the fiber asphalt concrete is stabilized. Degree has been greatly improved.
2.Improve the low temperature crack resistance, fiber adsorption on asphalt, leading to an increase in the optimal amount of asphalt in asphalt concrete, higher asphalt content, so that fiber asphalt mixtures still maintain flexibility and high temperature at -40 ℃ Tensile strength, effective resistance to shrinkage stress, enhance the low temperature crack resistance of the mixture, reduce the occurrence of temperature shrinkage cracks and can prevent the development of reflective cracks.
3. Improving anti-fatigue performance Asphalt pavement is subjected to repeated wheel load under the external temperature environment. When the load is repeatedly applied for more than a certain number of times, the stress generated in the pavement under the load will exceed the structural resistance to decrease in strength. It causes cracks on the pavement, resulting in fatigue fracture damage. After the polyester fiber is added, the uniform distribution of the fiber monofilament in the mixture increases the stiffness modulus and improves the fatigue resistance of the asphalt concrete.
4. Improving water stability. Water stability of asphalt pavement refers to the repeated action of asphalt pavement under the condition of water in the presence of water. The addition of polyester fibers makes the asphalt film thicker, reduces the strength of the water-replaced asphalt, and reduces the amount of water infiltrating the asphalt concrete. In addition, the adsorption of fibers makes the viscosity of the asphalt larger, which increases the asphalt and The cohesive force of the aggregate enhances the ability of the interface film formed by the asphalt and the aggregate in the asphalt mixture to resist the moisture peeling effect, thereby improving the water stability of the asphalt mixture.