Effect of Rejuvenating Agents on Performances of Aged SBS Modified Asphalt

Abstract

Rejuvenating seal, widely used due to its economic benefits and convenience, is one of the preventive maintenance methods. The rejuvenating seal materials (RSM) work on the surface course of asphalt pavement. This paper described the effects of RSM on the physical properties and rheological properties of aged SBS modified asphalt (ASMA). Two RSM, R and C, were involved in this research. The dosage of each RSM was 2%, 4%, 6%, 8%, and 10% of ASMA by weight. Physical properties, including softening point, penetration and ductility, were tested. Rheological properties were carried out by means of dynamic shear rheometer (DSR). Results show that RSMs, R and C, have improved the low-temperature performance and fatigue resistance. R has more positive effect on low-temperature performance and fatigue resistance of ASMA compared to values of C.

Minireview on the Rejuvenation of Aged Styrene–Butadiene–Styrene (SBS) Modified Bitumen: State-of-the-Art and Outlook

“…Among the existing studies, it was still common to use conventional rejuvenators and virgin base bitumen with high penetration to rejuvenate aged SBS modified bitumen. − By contrast, conventional rejuvenators and virgin base bitumen could only effectively rejuvenate aged base bitumen but had no influence on the degraded SBS modifier, leading to the unsatisfactory recovery effectiveness, especially for the properties including the elastic characteristics. In recent years, some scholars attempted to add virgin SBS modifiers or reactive rejuvenators to rejuvenate the degraded SBS modifiers. − Compared with only the rejuvenation of aged base bitumen, the rejuvenation of degraded SBS modifiers could rebuild the network structure and thus better improve the resistance to high-temperature rutting, low-temperature cracking, and fatigue cracking of rejuvenated bitumen.…”