Impact of Lime Modification of Asphalt and Freeze–Thaw Cycling on the Asphalt–Aggregate Interaction and Moisture Resistance to Moisture Damage
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 6
Abstract
Experiments were performed to investigate the impact on the moisture resistance of paving mixtures of the addition of hydrated lime directly to the asphalt prior to mixture preparation. Moisture resistance was evaluated on mixtures prepared using a strategic highway research program asphalt and limestone and granite aggregates by freeze–thaw cycling of the mixtures in water. Other parameters investigated in addition to hydrated lime that might affect moisture damage were oxidative aging and the addition of a model ketone to the asphalt. After the freeze–thaw cycling experiments, the specimens were subjected to selective solvent extractions to isolate the polar organic materials strongly adsorbed on the aggregate surfaces. Results of the extraction experiments indicate that the composition in the asphalt–aggregate interfacial region may change during repeated freeze–thaw cycling. Oxidative aging improved the resistance of the mixtures to moisture damage. Hydrated lime, when added to the asphalt prior to preparation of the mixtures, dramatically improved mixture resistance to moisture damage for both aggregates. The model ketone containing no additional polar chemical functionality reduced moisture damage resistance, suggesting that the apparent resistance of ketones formed in asphalt to displacement from the aggregate by water reported in previous studies resulted from strongly adsorbed, moisture resistant chemical groups contained on the same component as the ketone functional group. Results from the present study support previous work indicating that carboxylic acids play a major role in determining the moisture sensitivity of pavement mixtures.
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Acknowledgements
The writers gratefully acknowledge the Federal Highway Administration, U.S. Department of Transportation, for financial support of this project under Contract No. UNSPECIFIEDDTFH61-99C-00022. Thanks are expressed to Professor Khaled Ksaibati at the Department of Civil Engineering, University of Wyoming. and his student Ms. Elizabeth Rae Hunter for their physical property measurements. Thanks are also expressed to Mr. James Beiswenger and Ms. Deborah Sanchez for chemical data, and finally to Ms. Jackie Greaser for preparation of the manuscript. This document is disseminated under the sponsorship of the 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 paper 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 of 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 Western Research Institute.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 6 • December 2005
Pages: 711 - 718
Copyright
© 2005 ASCE.
History
Received: Apr 16, 2003
Accepted: Apr 8, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
Notes
Note. Associate Editor: Eyad Masad
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