Effect of Ultraviolet Aging on Fatigue Properties of Calcium Sulfate Whisker Modified Asphalt
FAN Taotao1,2,*, HAN Songkai2,3, SI Chundi1,2
1 School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 2 Hebei Key Laboratory of Traffic Safety and Control, Shijiazhuang 050043, China 3 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Abstract: Asphalt is susceptible to aging when exposed to ultraviolet radiation, leading to a reduction in fatigue resistance and service life of the pavement. To investigate the fatigue resistance and modification mechanism of calcium sulfate whiskers (CSW) modified asphalt under ultraviolet aging conditions, UV aging tests were conducted on matrix asphalt and three types of modified asphalt with varying contents (5%, 10%, 15%) of CSW. Fatigue parameters such as shear stress and shear strain were measured using linear amplitude scanning test. The fatigue life of UV aged asphalt was calculated based on the viscoelastic continuum damage model (VECD). The chemical composition and phase structure of UV aged asphalt were analyzed using FTIR and SEM tests. The results indicated that the proportion of viscoelastic components decreases due to UV aging. The addition of 5% CSW improves the fatigue resistance and extends life of asphalt under UV conditions. Furthermore, under identical UV aging conditions, the fatigue life of asphalt is influenced by the CSW content; higher CSW content leads to a lower fatigue life, with the optimal range being 5% to 10%. Physical adsorption between CSW and asphalt forms a network structure, enhancing the asphalt’s resistance to UV aging.
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2025, Vol. 39 
