NEXCEL Project Paper 38
Release time: 2025/05/26 Publisher： original Views：
Investigating the role of sulfur stabilizer in modulating aging properties of SBS-modiffed asphalt
Zhang Junjie from Harbin Institute of Technology, Principal Investigator of NEXCEL 2024 PHD project ‘Research on the Composite Aging Mechanism and Phase Structure of SBS-Modified Asphalt Multiphase Systems,’ has published a paper entitled "Investigating the role of sulfur stabilizer in modulating aging properties of SBS-modiffed asphalt" in "Construction and Building Materials" (SCI) recently.
Stabilizers are commonly employed in SBS-modiffed asphalt, yet their speciffc impact on aging behavior remains ambiguous. Past studies have not agreed on their role and have primarily examined effects on the SBS polymer phase, neglecting asphalt phase inffuences. Understanding these interactions is essential for aging mechanisms and rejuvenation strategies. To solve this issue, this study compared three types of asphalt to analyze their properties during aging. Microscopic tests comprising morphology, chemical structure, and molecular weight analyses with nine quantitative indicators were conducted, and the distinct inffuences of stabilizers on asphalt and SBS polymer phases were elucidated. The results revealed that the change rate in the physical properties of SBS-modiffed asphalt during aging decreases with sulfur addition, rheological parameters indicated that sulfur predominantly protects the polymer network structure from degradation during short-term aging. Furthermore, stabilizers had no explicit impact on the carbonyl index but could delay the generation of asphaltene molecules during aging, the change rates of asphaltene% were 1.65% without stabilizers and 12.36% with them after TFOT (Thin fflm oven test) aging. Stabilizers also notably mitigated polymer degradation and exhibited beneffcial effects even during PAV (Pressure aging vessel) aging. The overall ffndings contribute to a clearer understanding of the complex interplay among the various components of SBS-modiffed asphalt, such as base asphalt, SBS modiffers, and stabilizers, providing theoretical insights into aging mechanisms and rejuvenation strategies involving stabilizers.
Construction and Building Materials 425 (2024) 136045
https://doi.org/10.1016/j.conbuildmat.2024.136045
