Asphalt Binders Blended with a High Percentage of Biobinders: Aging Mechanism Using FTIR and Rheology
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 4
Abstract
The objective of this study is to characterize the rheological properties and aging mechanism of asphalt binders blended with high percentages of biobinders using Fourier transform infrared spectroscopy (FTIR). The petroleum asphalt was partially replaced by the biobinders at fractions of 30 and 70% by weight. Rotational viscometer (RV) and dynamic shear rheometer (DSR) tests were conducted for the rheological properties, and the rolling thin film oven (RTFO) test was conducted for the aging simulation. Loss of volatiles was obtained from the RTFO test, whereas the oxidation characterization was investigated through the FTIR test. The rheology results showed that the bioblended asphalt binder exhibit different rheological properties as compared with the control asphalt binder before and after the RTFO-aging. The mass loss test showed that the loss of volatiles of biobinders were much higher than the control asphalt binder. FTIR spectra analysis showed that additional , , and OH bonds were generated during the aging. Further chemical analysis revealed that the aging of biobinder originates from three aspects: the loss of volatiles, the dehydrogenation which formulates higher molecular weight compounds such as asphaltene, and the oxidation which resulted in chemicals such as acids, alcohol, and ester.
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Acknowledgments
The research work was partially sponsored by the Federal Highway Administration through Michigan Department of Transportation (MDOT). The authors also appreciate the guidance and involvement of Nathan Maack, Andre Clover, Benjamin Krom, and John Barak of MDOT. This research could not have been completed without the contributions of Dr. R. Christopher Williams. The authors appreciate Christopher DeDene, James Vivian, Morgan Hensen for the assistance on materials and data collection. MDOT assumes no liability for its content or use thereof. The content of this report reflect the views of the authors, which is responsible for the accuracy of the information presented in this paper. The contents may not necessarily reflect the views of MDOT and do not constitute standards, specifications, or regulations.
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Journal of Materials in Civil Engineering
Volume 27 • Issue 4 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 4, 2013
Accepted: Apr 29, 2014
Published online: Jul 30, 2014
Discussion open until: Dec 30, 2014
Published in print: Apr 1, 2015
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