Adherence Energy of Asphalt Thin Films Measured by Force-Displacement Atomic Force Microscopy
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 12
Abstract
Viscoelastic materials exhibit rate- and temperature-dependant behavior in terms of stress-strain response and fracture. As a representative of this class of materials, rate-dependant fracture should be expected for the bituminous asphalt binders used in the construction of pavement. Preliminary results are reported regarding studies using atomic force microscopy (AFM) to determine rate- and temperature-dependent adhesive fracture in bitumen thin films. This AFM technique involves creating then fracturing a microadhesive contact joint between a bitumen thin film and a glass microbead tip affixed to a cantilever by application of a direct tensile force to the contact. The mechanical work required to fracture this contact is measured as a function of temperature and separation rate. Results of this study suggest that adherence fracture energy of bitumen films is rate and temperature dependant based on measures of energy dissipation at and below the temperature of 25°C. These materials also exhibit a viscoelastic to viscous transition in adhesive behavior above 25°C attributed to observed loss of energy dissipation.
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Acknowledgments
The authors gratefully acknowledge the Federal Highway Administration, U.S. Department of Transportation, for their financial support: Contract No. DTFH61-07-D-00005 and DTFH61-07-H-00009.
Disclaimer
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. The contents of this report reflect the views of Western Research Institute, which is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or the policy of the United States Department of Transportation. Mention of specific brand names of equipment does not imply endorsement by the United States Department of Transportation or by Western Research Institute.
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Journal of Materials in Civil Engineering
Volume 26 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 6, 2013
Accepted: Dec 6, 2013
Published online: Dec 9, 2013
Discussion open until: Nov 18, 2014
Published in print: Dec 1, 2014
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