Microdamage Healing in Asphalt and Asphalt Concrete, Volume 4: A ViscoelasticContinuum Damage Fatigue Model of Asphalt Concrete with Microdamage Healing

摘要

A mechanistic approach to fatigue characterization of asphalt-aggregate mixturesis presented in this volume. This approach is founded on a uniaxial viscoelastic correspondence principle is applied in order to evaluate damage growth and healing in cyclic loading separately from time-dependent characteristics of the material. The damage growth during loading cycles and healing during rest periods are modeled using work potential theory, a continuum damage theory based on thermodynamics of irreversible processes. Internal state variable formulation was used in developing the analytical representation model. Tensile uniaxial fatigue tests were performed in the controlled-strain mode with different strain amplitudes to determine model parameters.