Evaluation of Rheological and Microscopic Properties of SBS-Modified Asphalt Binder with Multiple Regeneration
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
Styrene-butadiene-styrene (SBS) modified asphalt binder after aging seriously affects the performance of the road. In this study, waste edible oil, SBS modifier, plasticizer and antiaging agent were used to prepare a new regenerant to achieve the effect of regeneration of aged SBS modified asphalt binder. The type and optimum dosage of regenerant were determined by conventional performance test of asphalt binder. Dynamic shear rheology (DSR), bending beam rheology (BBR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC) were conducted to study the effects of regenerant on the rheological and microscopic properties of SBS modified asphalt binder with different aging degrees. The results show that the B-type regenerant has the best recovery effect on the aged asphalt binder. The optimum regenerant content corresponding to PAV10h, PAV20h, and PAV30h is 6wt%, 8wt%, and 10wt%, respectively. With the increase of aging degree, phase angle () and creep rate (m) of SBS modified asphalt binder decreased, complex shear modulus (), rutting factor (), and creep stiffness (s) increased. Besides, sulfoxide index (SI), carbonyl index (CI), large molecular weight (LMS) increased, and butadiene index (BI), and small molecular weight (SMS) decreased. When the regenerant is added, the rheological index and microindex content of the recycled SBS modified asphalt binder are opposite to those of the aged asphalt binder. In addition, microscopic analyses showed that the SBS modifier in the regenerant could reinteract with the asphalt binder and adjust the composition of the aged asphalt binder. Therefore, this study provides a new reference for realizing the regeneration of aged SBS modified asphalt binder, whereas the regenerated asphalt binder can be considered to be added to the asphalt mix to study the actual road performance.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was sponsored by the National Key R&D Program of China (Grant No. 2018YFE0103800), and Fundamental Research Funds for the Central Universities, CHD (Grant No. 300102219316). The authors gratefully acknowledge their financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 12 • December 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 11, 2023
Accepted: Apr 19, 2023
Published online: Sep 27, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 27, 2024
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