Continuum damage mechanics-based fatigue model of asphalt concrete

A fatigue performance prediction model of asphalt concrete is developed fro m a uniaxial constitutive model based on the elastic-viscoelastic correspon dence principle and continuum damage mechanics through mathematical simplif ications. This fatigue model has a form similar to the phenomenological ten sile strain-based fatigue model. Therefore, a comparison between the new mo del and the phenomenological model yields that the regression coefficients in the phenomenological model are functions of viscoelastic properties of t he materials, loading conditions, and damage characteristics. The experimen tal study on two mixtures with compound loading histories demonstrates that the fatigue model maintains all of the strengths of the constitutive model such as its accuracy and abilities to account for the effects of race of l oading, stress/strain level dependency, rest between loading cycles, and mo de-of-loading on fatigue life of asphalt concrete.