Micromechanical and Chemical Characterization of Foamed Warm-Mix Asphalt Aging
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
This study evaluates the effects of aging on the micromechanical and chemical properties of foamed warm-mix asphalt (WMA) and hot-mix asphalt (HMA) materials. Two asphalt binders were considered. Atomic force microscopy (AFM) was used to examine the micromechanical and adhesion properties of the asphalt binders considered at different aging conditions. In addition, Fourier-transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) techniques were used to identify and quantify the changes in the chemical composition of different asphalt binders due to aging. The results of the AFM tests indicated that the reduced modulus values of the asphalt binders increased with the aging of these binders, while the bonding energy decreased. In addition, the results of the AFM, FTIR, and GPC tests suggested that the WMA binders will experience equal or less aging over the service life of a pavement structure as compared to HMA binders. Good correlations were obtained between the micromechanical and adhesion properties of the considered asphalt binders measured using the AFM and their chemical properties obtained using the GPC and FTIR tests.
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Acknowledgments
This study was sponsored by the Ohio Department of Transportation (ODOT) and the Federal Highway Administration (FHWA). Their support throughout this study is greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 15, 2017
Accepted: Mar 19, 2018
Published online: Jun 28, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 28, 2018
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