Improving effect and mechanism on service performance of asphalt binder modified by PW polymer

To achieve the improving effect of polymer material on the sustainability of asphalt pavement materials, the PW modifier was selected as anti-aging modifier of asphalt. The microscopic morphology and structural characteristics of polymer modifier were characterized by using focused ion beam electron microscopy and energy-dispersive spectrometer. The functional group composition of the PW modifier was analyzed by Fourier transform infrared spectroscopy. The PW-modified asphalt was prepared for ultraviolet (UV) aging resistance evaluation. The microscopic morphology and surface roughness evolution of polymer-modified asphalt were investigated during the whole period of UV aging. Under the condition of UV aging, the functional group composition of polymer-modified asphalt was studied. The results showed that the microscopic morphology of the PW polymer modifier was mainly crystal structure, mainly composed of C and O elements. The PW polymer modifier could improve the aging resistance of asphalt binder effectively and alleviate the generation of asphalt microcracks in the process of UV aging. The addition of PW polymer modifier could inhibit the formation and accumulation of typical functional group inside asphalt binder during the UV aging period, which could achieve the effective control of asphalt UV aging behavior.