Limited studies in recent years have shown that
asphalt pavement subject to seawater in coastal regions or deicing
salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of
salt on rheological properties of
asphalt after long-term aging. In this study, rheological properties of unmodified and
polymer-modified
asphalt after long-term aging were tested after being soaked in different concentrations of
salt (0.3%~5%) for different durations (1 day~30 days). Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged
asphalt after being soaked for complex modulus and phase angle master curves and ultimate
fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and
fatigue resistance properties and improved high temperature properties of aged
asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies.