Abstract:In order to study the different stages of aging asphalt fatigue performance, based on the heat and oxygen aging, ultraviolet light, and water coupling before and after the 90 # scanning linear amplitude matrix asphalt, SBS modified asphalt (LAS) and dielectric constant test, from two angles of damage accumulation and phase Angle change discussed the change of the different stages of aging asphalt fatigue performance,The relationship between the slope absolute value B of asphalt component and fatigue strain curve based on dielectric properties, fatigue failure parameters based on damage and fatigue failure parameters and based on phase Angle are analyzed. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance.It is reasonable and feasible to use the failure strain and fatigue life defined by the damage-based fatigue failure criterion to evaluate the anti-fatigue performance of asphalt, and it is consistent with the analysis results of the failure strain and fatigue life defined by the phase Angle fatigue failure criterion.It can be seen that the method to divide asphalt components based on dielectric properties is reasonable and feasible, and can be correlated with asphalt pavement performance to further guide the asphalt modification process.