Evaluation of the Rheological Properties and Activation Energy of Virgin and Recovered Asphalt Binder Blends
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 3
Abstract
In this study, the rheological properties and activation energy (AE) of unaged and aged asphalts blended with different percentages of binder, recovered from three reclaimed asphalt pavement (RAP) sources, were investigated. Superpave asphalt binder tests were used to evaluate the effects of the recovered asphalt binder source and content. The results indicated that the addition of recovered binder from each source increased the viscosity, , and . The increase in viscosity per 1% recovered binder was evaluated using non-dimensional viscosity index (). In addition, the increase in and per 1% recovered binder were investigated using relative Superpave rutting gradient (RSRG) and relative gradient (RG) factors, respectively. The results indicated that the , RSRG, and RG depended on recovered binder source, content, aging, and test temperature. The interpretation of the AE results depended on the physical phase of the asphalt blends, irrespective of the recovered binder source and content. The AE increased when the physical phases of the asphalt blends were in liquid and semiliquid (high phase angle) states over the range of temperatures tested compared with the control asphalt binder. However, the AE decreased when the physical phase of the asphalt blend samples was solid (low phase angle).
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Acknowledgments
The authors would like to acknowledge the Malaysian Ministry of Higher Education for funding this research through the Exploratory Research Grant Scheme, which enabled this paper to be written. The authors also wish to thank the technicians of the Highway Engineering Laboratory at the Universiti Sains Malaysia.
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© 2014 American Society of Civil Engineers.
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Received: Mar 17, 2013
Accepted: Jan 6, 2014
Published online: Jan 8, 2014
Discussion open until: Dec 21, 2014
Published in print: Mar 1, 2015
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