Regeneration mechanisms of aged SBS modified asphalt from RAP materials

Molecule structure, morphology, phase transition, and interface adhesion characteristics

Journal article (2023)

Authors

Fuqiang Dong Hohai University
Jincheng Wang Hohai University
Xin Yu Hohai University
Mengmeng Jiang Hohai University
Yongjia Guo Jiangsu Hi-speed New Material Technology Co., Ltd.
Shiyu Wang Hohai University
Yuanzhe Zu Hohai University
S. Ren Pavement Engineering - CEG
Research Group
Pavement Engineering (CEG) (TU Delft)
Copyright: © 2023 Fuqiang Dong, Jincheng Wang, Xin Yu, Mengmeng Jiang, Yongjia Guo, Shiyu Wang, Yuanzhe Zu, S. Ren
DOI
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https://doi.org/10.1016/j.conbuildmat.2023.131689
Morphology Molecular structure Aged SBS modified asphalt Interface adhesion characteristics Regenerant agent Regeneration mechanisms
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

In this study, the environmentally friendly rejuvenators with waste thermal conductive oil, polymer, and the interfacial reinforcing agent were prepared. And the influence of the different rejuvenators on the rejuvenation mechanisms of aged SBS modified asphalt was characterized by different scales including the molecule structure, morphology, phase transition and interface adhesion characteristic, and macro performance. The results show that the thermal-oxidative aging process increases the molecular weight of asphalt, promotes the SBS phase to agglomerate, and decreases the high and low temperature performance, thermal stability, and adhesion. When the rejuvenator was added, the molecular weight distribution of asphalt binders can be improved, while adding the regenerant-II can supplement the SBS modifier and reform the cross-linking structure. Furthermore, the regenerant-II has a better recovery effect on the morphology structure and resumes the thermal behavior. And then softening point and ductility can be recovered by 89.7% and 94.8% of the original SBS modified asphalt. Under the action of the interfacial reinforcing agent, the regenerant-III could increase the adhesion work to 95.49% of the original SBS modified asphalt.