Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 3
Abstract
Traditional rejuvenators normally have a great deal of heavy fuel oils to supply the light oil component of asphalt binders, which decreases throughout a long-term aging process. However, heavy fuel oils can easily volatilize at a high recycling temperature (above 180°C), and this leads to a limited portion of reclaimed asphalt pavement (RAP) materials utilized in the recycled asphalt mixture (with a recycling rate less than 30%). Vegetable oils are rich in unsaturated fatty acids, which are similar to the light oil components, and have a better temperature resistance. Therefore, there is potential that vegetable oils can be utilized to recover the aged asphalt binder based on the asphalt rejuvenating mechanism. In this study, two rejuvenators with waste cooking vegetable oils (corn oil and soybean oil) to replace heavy oils and a commercial rejuvenator were used to recover the aged asphalt (extracted from RAP materials) with different ratios (by weight of asphalt) of 2, 4, 6, 8, and 10%. Dynamic shear rheometer (DSR) and rotational viscosity (RV) tests were used to evaluate the physical properties of the recovered asphalt binder. The low-temperature performance of the recovered asphalt binder was also evaluated by the bending beam rheometer (BBR) test. The laboratory tests and statistical analysis of variance (ANOVA) results show that the vegetable oil rejuvenators can effectively decrease the viscosity and stiffness of aged asphalt binder, which is beneficial for both fatigue and low-temperature cracking resistance. Furthermore, the rejuvenator can lower the viscosity and stiffness of the aged asphalt binder with a larger amount of vegetable oil. Overall, the vegetable oil content (6% to 8%) in the rejuvenator is proposed for recovering the aged asphalt binder in consideration of the rutting resistance under high temperatures.
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Acknowledgments
The research is supported by the National Natural Science Foundation of China (Grant No. 51308030), the Beijing Natural Science Foundation (Grant No. 8144042), the Beijing Nova Program (Grant No. Z141106001814037) and the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (Grant No. PXM2013-014210-000165). The authors would like to thank Professor Winggun Wong at the Hong Kong Road Research Laboratory (HKRRL), and Mr. Jinqi Gao at Beijing University of Civil Engineering and Architecture (BUCEA) for their active contributions to this research.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 3 • March 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Feb 29, 2016
Accepted: Jul 28, 2016
Published online: Oct 27, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 27, 2017
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