Comparative Characterization of Field and Laboratory-Aged Binders Modified with Antioxidant Additives and Copolymers Using Fourier Transform Infrared Spectroscopy and Gel Permeation Chromatography
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 148, Issue 2
Abstract
This study investigates the behavior of antioxidant additives and copolymers to an asphalt binder by comparing laboratory-aged (up to 60 h) and antioxidant-modified binders with binders extracted from field cores. To evaluate the change in carbonyl, sulfoxide, aromatic, and aliphatic compounds of asphalt binders due to both lab and field-aging, spectral analysis was performed using Fourier transform infrared spectroscopy. A good correlation was found between carbonyl growth and viscosity in the field-aged binders. Chemical analysis with gel permeation chromatography showed that the quantity of large particle sizes increases with the increase in carbonyl growth due to aging. Both Redicote and Solprene were found to retard the growth of large molecular size particles in lab-aged binders when compared to field-aged binders. This study provides further validation of the use of Redicote and Solprene in retarding the aging of asphalt binders. The advanced chemical characterization conducted in this study can be used to evaluate the effectiveness of antioxidant additives and copolymers in retarding oxidative aging and selecting the proper products that work better with specified asphalt binders.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This paper was made possible by an NPRP grant (NPRP 6-773-2-320) from the Qatar National Research Fund (a member of the Qatar Foundation). The findings in this paper reflect the work and are solely the responsibility of the authors.
Disclaimer
The contents of the paper reflect the views of the authors, who are responsible for the facts and accuracy of the data presented in this paper. This paper is not intended for any marketing, branding, advertising, or promoting any of the commercial products used in this study.
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Published In
Journal of Transportation Engineering, Part B: Pavements
Volume 148 • Issue 2 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 13, 2021
Accepted: Jan 31, 2022
Published online: Apr 12, 2022
Published in print: Jun 1, 2022
Discussion open until: Sep 12, 2022
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