Moisture Damage in Asphalt: Analysis Based on the Dewetting Mechanism
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
In this study, the role of the dewetting mechanism in moisture damage of asphalt pavements was investigated. Three main asphalts, and mainly two antistrip additives, were utilized. A unique dewetting-based moisture damage test procedure was developed consisting of a moisture conditioning procedure and quantitative analysis of the dewetting with the use of a microscope and an application software. The dewetting analysis procedure includes measurements of the total dewetted area and number of dewetted holes. It was observed that the dewetting phenomenon occurs primarily under a trapped air bubble in the asphalt film submerged in water. Polymer (styrene butadiene styrene) in PG 76-22M (modified) asphalt did aid in reducing dewetting. At high pH, 10, the Adhere LOF 6500 additive increased dewetting for all three asphalts. The critical film thickness for all three asphalts was estimated experimentally and found to be 300 μm. The findings of this study on understanding the role of dewetting on moisture damage in asphalt pavements will assist in the implementation of a unique dewetting-based moisture damage test procedure and analysis.
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Acknowledgments
The authors would like to thank the Louisiana Transportation Research Center (LTRC) for providing funding for this project. Also, the authors would like to thank Chris Abadie, P.E., for providing specific insights into the research. The authors are grateful to Readul Islam, former graduate research assistant, for strong discussion on this research.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 24, 2016
Accepted: Aug 23, 2016
Published online: Jan 17, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 17, 2017
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