Static And Dynamic Performance Of Polyester Fiber Reinforced Asphalt Concrete

Highway construction has been developed more rapidly as the national economy increase in China. However, the early damage of pavement is especially serious. Concurrently, high quality and durability of the pavement is urgently demanded. Asphalt concrete reinforced with polyester fiber is a new pavement material, and it can improve the performance of pavement effectively and extend the lifetime of pavement. It is important that fiber reinforced asphalt concrete is widely used in pavement engineering in order to discuss the performance of fiber reinforced asphalt concrete and practicality of asphalt pavement thoroughly.Firstly, the static resilient modulus of the fiber reinforced asphalt concrete is received by means of static compression test method, and the mechanism of fiber reinforced asphalt concrete as well as reasonable value of resilient modulus is analyzed. Based on the test method, the dynamic modulus of the material is measured under the dynamic loads, and relation between static modulus and dynamic modulus is given. Results indicate the inclusion of the proper polyester fiber meaningfully improve the mechanics parameters, and moreover effectively increase road performance. The variations between fiber content and compressive strength, static and dynamic modulus of fiber reinforced asphalt concrete have been acquired. The reasonable content of fiber by weight of asphalt concrete is 0.20%-0.25% for considering increasing mechanics performance.Secondly, the uniaxial static compression creep test is conducted to study the creep properties of asphalt concrete with different fiber contents. The test results show that the creep response of fiber reinforced asphalt concrete is similar to that of conventional asphalt concrete except the difference of creep deformation. The viscoelastic characteristics are analyzed according to the viscoelastic model. A mathematical model called four-units five-parameters for viscoelastic materials is established to express creep characteristics of fiber reinforced asphalt concrete, in which the five parameters are determined from tested results. The newly suggested equations...