Evaluation for Warm-Mix Additive-Modified Asphalt Binders Using Spectroscopy Techniques
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 2
Abstract
The recent increased interest in “fingerprinting” or identifying commonly used construction materials such as asphalt binders is expected to continue in years to come. To capture the basic fingerprint of asphalt binders, spectroscopy devices can be handy and useful. In particular, this study evaluated the effects of two warm-mix asphalt (WMA) additives, Sasobit and aspha-min, on the chemical compositions of a performance grade binder (PG 64-22). Spectroscopy techniques including Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), and X-ray photo electron spectroscopy (XPS) were used in this study. Mass precipitated asphaltenes and maltenes and straight-run asphalt binder samples were analyzed using these techniques, and test results were compared with the rheological data. The effectiveness of an antistripping agent (ASA), AD-here HP Plus, on a WMA-modified binder was also evaluated. Furthermore, the effects of aging on chemical compositions of the ASA-modified binder were evaluated. Spectroscopy analysis data from this study were in agreement with high-temperature performance data of the tested binders. The findings of this study are expected to help in fingerprinting WMA mixes.
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Acknowledgments
The authors would like express their sincere appreciation to the Federal Highway Administration (FHWA), the Oklahoma Department of Transportation (ODOT), and the Oklahoma Transportation Center (OkTC) for providing financial support for this study. The authors would like to thank Valero refinery at Ardmore in Oklahoma, Sasol Wax plant at Richmond in California, and ArrMaz Custom Chemicals in Mulberry, FL for supplying the binder and additives used in this study. The authors express their sincere gratitude to Dr. Joakim Laguros at the Univ. of Oklahoma (OU), Dr. Steve Cross at Oklahoma State Univ., and Mr. Danny Gierhart at Asphalt Institute for their valuable inputs throughout this project. The authors are thankful to former and current students of OU Justin Sneed, Jackson Autrey, and Curtis Doiron for their technical assistance in this project. The authors are also grateful to Michael Schmitz, Karen Horne, and Holly Chronister, all from OU, for their technical and administrative assistance throughout this project.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 2 • February 2013
Pages: 149 - 159
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 15, 2011
Accepted: Apr 19, 2012
Published online: Apr 23, 2012
Published in print: Feb 1, 2013
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