WATER AGING OF ASPHALT DURING ITS SERVICE LIFE OF PAVEMENTS

In order to signify the impacts of rainwater on aging of asphalt during its service life of pavement, the factor of moisture was considered in the pressure aging vessel (PAV), termed as long-term aging tests to simulate asphalt aging in the service life. The SHRP parameters-rut factor (G~*/sinδ) and low-temperature strength module (S(t)) were adopted to express the high- and low-temperature properties of the aging asphalt, respectively. With the conjunct action of heating and oxygen, it was found that the existence of moisture in PAV put a notable role on parameter G~*/sinδ. And then it was proposed that the factor of moisture be added in the PAV test process for improving the accuracy of simulating the service condition of asphalt. The results also showed that duo to the existence of moisture in PAV the trial time could be shortened at least 5h,as only considering its effect on SHRP parameter G~*/sinδ.