Effect of Fiber Content on Viscoelasticity of Asphalt Concrete

An experimental investigation was conducted to analyze the viscoelasticity of polyester fiber reinforced asphalt concrete. The cylinder specimens of asphalt concrete contained 0, 0.15%, 0.2%, 0.25%, 0.3% polyester fibers by weight of asphalt concrete were tested on MTS810 by methods of uniaxial static compression creep test under 45 °C. 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. A viscoelastic model called "four-unit, five-parameter" is employed to describe creep characteristics of fiber reinforced asphalt concrete, in which the five parameters (E₁,E₂,η₂,A,B) are determined from experimental result (E₁,B,E₂,η₂) are sensitive to fiber contents, and relations of parameters and fiber contents are simulated in nonlinear fit. The new viscoelastic model including fiber content is to calculate the load process of test and to analyze the influences of fiber content on the viscoelastic property of asphalt concrete. The numerical results show good consistency with experimental data. The composite with 0.2% fiber shows the best result.