Effects of Regular-Sized and Nanosized Hydrated Lime on Binder Rheology and Surface Free Energy of Adhesion of Foamed Warm Mix Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 9
Abstract
Although foamed warm mix asphalt (WMA) offers many potential benefits, there are some performance concerns. Researchers are making efforts to study the usage of different additives as modifiers to meet standard specifications of asphalt mixes for paving applications; however, selection of an appropriate modifier is extremely important to better performing asphalt. In recent years, there has been a dramatic interest in research, technology, and production of nanoparticles (nanomaterials). The current study was conducted with the objective of addressing the potential benefits of using nanosized hydrated lime (NHL) compared with regular-sized hydrated lime (RHL) as a modifier to the WMA produced using an additive. This paper documents the findings of the effect of NHL and RHL on the asphalt binder rheology and provides an insight into their effect on the free energy of adhesion of the asphalt binder–aggregate system. The rheology of asphalt binder was investigated based on the dynamic shear rheometer (DSR) test, whereas the free energy of adhesion was quantified based on the surface free energy (SFE) measurements of the asphalt binders and aggregate. Rheology results showed that the addition of NHL in smaller amounts can provide improved characteristics as compared with RHL. In concurrence with the rheology results, the free energy of adhesion showed that the NHL is more competitive compared with the RHL. Foaming the asphalt binder adversely affects the asphalt binder-to-aggregate adhesion.
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Acknowledgments
This material is based in part on work supported by the National Science Foundation under project 1300286. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. We would also like to acknowledge funding for conducting the USD testing from the University of Oklahoma Research Council and the Oklahoma Department of Transportation. Moreover, we would like to acknowledge funding from State of Michigan—Research Excellence Fund for this study.
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Journal of Materials in Civil Engineering
Volume 27 • Issue 9 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 9, 2014
Accepted: Oct 20, 2014
Published online: Dec 3, 2014
Discussion open until: May 3, 2015
Published in print: Sep 1, 2015
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