Utilizing Fluorescence Microscopy for Quantifying Mobilization Rate of Aged Asphalt Binder
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 12
Abstract
The asphalt paving industry has been increasing the use of recycled asphalt pavement (RAP). There is a concern about the percentage of aged asphalt binder in the RAP that can actually be blended into the virgin binder and thus become available to coat the aggregate. In this study, a laboratory procedure was proposed for quantifying the mobilization rate of the aged binder using fluorescence microscopy. A new parameter, the mean gray value (MGV), was derived from the fluorescence image and used to differentiate between the recycled and virgin binders as well as their blends. A blending chart was generated according to the MGV for the virgin-aged asphalt blends containing 0–100% RAP binder and was used as a baseline for the quantification. A linear relationship was found between the MGV and the RAP binder content. A laboratory experiment was conducted to validate the proposed method. Glass cullet was added as a special type of aggregate so that it could be retrieved after mixing and tested by fluorescence microscopy. The results showed that the mobilization rate of the RAP binder from the fluorescent method was improved with an extended mixing time and an elevated temperature.
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Acknowledgments
The authors would like to acknowledge the financial support from the National Science Foundation of China (NSFC) under the Grant No. 51578415 and from the Federal Highway Administration and Tennessee Department of Transportation. The results in this paper represent the views from the authors and may not necessarily reflect the views from any of the sponsors.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 26, 2017
Accepted: May 31, 2017
Published online: Oct 9, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 9, 2018
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