Influences of Aging on the Properties of SBS-Modified Asphalt Binder with Anti-Aging Agents: Fid-Bau Portal

Influences of Aging on the Properties of SBS-Modified Asphalt Binder with Anti-Aging Agents

Cong, Peiliang / Guo, Xize / Mei, Linna / Zhang, Yihan

Three anti-aging agents, including pentaerythritol propionate (1010), bissebacate (770) and bumemetazole (UV326), were selected to improve the aging resistance of SBS-modified asphalt binder (SBSMA). The objective of this study was to determine an optimal combination of those anti-aging agents, namely 1%1010 + 0.5%770, 1%1010 + 0.5%UV326 and 1%1010 + 0.5%770 + 0.5%UV326. The influences of aging on the physical properties of asphalt binders were characterized by a series of conventional tests. Dynamic shear rheometer tests were utilized to describe the rheological behavior and fatigue resistance of asphalt binders. Finally, the evolution of the main functional groups of asphalt binders was analyzed by Fourier transform infrared (FTIR) tests. Several aging indexes were defined to evaluate the aging degree of asphalt binders. Experimental results showed that the anti-aging agents had little influence on the rheological and physical properties for unaged SBSMA, and they did not change the chemical structure of the original SBSMA. However, the results on various aging indexes proved that the thermal oxidative aging resistance of SBSMA was effectively improved by the anti-aging agents. The G^*sinδ values indicated that improvement of fatigue resistance of SBSMA was dependent on the combinations of anti-aging agents. Except 1%1010 + 0.5%770, other two composite anti-aging agents could improve the cracking resistance of SBSMA. The FTIR results showed that the anti-aging agents could restrain the generation of carbonyl compounds and the degradation of SBS polymer. Among composite anti-aging agents investigated, the synergic effect of 1010 and UV326 may be the best in practice after considering both rheological and anti-aging properties .