Influence of Warm-Mix Additives and Reduced Aging on the Rheology of Asphalt Binders with Different Natural Wax Contents
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 10
Abstract
This paper presents the results of our study to investigate the influence of natural wax in asphalt binders, warm-mix asphalt (WMA) additives, and reduced short-term aging on viscosity, stiffness, susceptibility to permanent deformation, fracture resistance, and thermal cracking resistance of asphalt binders. We used two controls to differentiate between the influence of WMA additive and that of reduced aging on the rheology of asphalt binders. The asphalt binder used in a WMA undergoes reduced short-term aging and consequently has relatively reduced stiffness compared with the binder in a similar hot-mix asphalt (HMA). Results indicate that certain WMA additives compensate, whereas others aggravate the initial reduced stiffness of asphalt binders used in WMA. Short-term aged binders with high natural wax content demonstrated strong interactions with some of the WMA additives and increased susceptibility to permanent deformation. In most cases, pressure aging vessel (PAV) residues of binders with WMA additives had similar or lower fracture resistance compared with PAV residues of binders that were subjected to conventional short-term aging. Results from this study suggest that strategies—such as the use of recycled asphalt—to compensate for the initially reduced stiffness of binders in WMA mixtures must be carefully selected for each asphalt binder–WMA additive pair to avoid an adverse impact on the fatigue cracking performance of the mix.
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Acknowledgments
The authors would like to thank MeadWestvaco Asphalt Innovations, Sasol Wax, Akzo Nobel, and Ceca Arkema Group for their assistance in providing the WMA additives used in this study, and Mr. Jorge Leal for some of the laboratory testing. The authors greatly appreciate the Texas Department of Transportation (TxDOT) for supporting this research, and they also thank Dr. German Claros, Mr. Dale Rand, and Mr. Jerry Peterson for their help with this research. The results and discussions expressed in the paper are solely those of the authors and do not reflect the views of TxDOT.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 10 • October 2011
Pages: 1453 - 1459
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 22, 2010
Accepted: Mar 31, 2011
Published online: Apr 2, 2011
Published in print: Oct 1, 2011
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