Ultrasonic cavitation and mechanical vibration promote the homogenisation, dispersion, and swelling of SBS in asphalt, making ultrasonication an effective auxiliary method for preparing SBS-modified asphalt. However, intense ultrasonic energy may cause mild thermal and mechanical degradation of asphalt components, leading to dosage-dependent changes in the rheological and chemical properties of SBS-modified asphalt. In this study, a self-developed ultrasonic device was used to treat SBS-modified asphalt, and its performance responses at different dosages were systematically evaluated in terms of compatibility, rheological behavior, deformation resistance, fatigue, low-temperature relaxation, and aging characteristics in detail. Results showed that ultrasonication enabled more SBS particles to melt into the asphalt, significantly improving modifier-asphalt compatibility. It also enhanced the elastic characteristics of the modified asphalt and improved rutting deformation recovery, fatigue resistance, and low-temperature stress relaxation. Furthermore, ultrasonic treatment improved the short-term aging resistance of asphalt but reduced its long-term aging resistance.
Wang et al. (Fri,) studied this question.
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