2021 Volume 77 Issue 2 Pages I_1-I_9
Viscoelastic parameters such as phase angle and unit dissipated energy derived from fatigue tests of asphalt mixture correlate with the number of cycles to fatigue failure. The heat-deterioration changes viscoelasticity of asphalt binder and affects the fatigue life of the asphalt mixture. This study conducted the direct tensile tests and repeated compressive- tensile tests for the heat-deteriorated asphalt mixtures.The effects on fatigue failure with changing the viscoelasticity were investigated by clarifying the relationships between the viscoelastic parameters of the heat-deteriorated asphalt mixtures and their fatigue damage properties. As a result, it was found that the stiffness of the heat-deteriorated asphalt mixture increased, the phase angle and the unit dissipated energy decreased, and the fatigue life tended to prolong. When the heat-deteriorated asphalt mixtures have viscoelastic property, the fatigue life does not always increase.
