VISCOELASTIC DAMAGE CHARACTERISTICS OF ASPHALT BASED ON CREEP TEST

The creep tests of asphalt beam were carried out at different temperatures by using Bending Beam Rheometer (BBR). The creep compliance curves were obtained. By shifting, the shift factors are deduced by Williams-Landel-Ferry (WLF) equation and the creep compliance master curve clusters are obtained at different temperatures. A viscoelastic damage model is established by coupling the continuum damage factor into the Burgers viscoelastic model. The distribution of the asphalt inner flaw is described by Weibull function. The theoretical model shows good agreement with the experiment results, which indicates that it is necessary to consider the influence of damage effect during the evaluations of asphalt viscoelastic characteristics.