Aging Characteristics of RAP Blend Binders: Rheological Properties
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
A study involving two rolling-thin-film-oven–aged asphalts and their blends with 15 and 50% of extracted reclaimed asphalt pavement (RAP) binders was conducted to investigate the effect of RAP content and properties on the long-term aging characteristics of asphalt binders. The results from rheological analyses of aged, blended binders indicate that the aging characteristics of blended binders are dependent on fresh asphalt binders. The results show that the crossover frequency decreases at an exponential form as RAP concentrations increase, and the rheological index increases as RAP concentration increases. The pattern for stiffness increase as a function of aging times for RAP-blended binders is similar to that of a typical chemical-aging kinetic model, in which the stiffness increases substantially initially and then levels off at longer aging times. The results demonstrate that there is a linear relationship between the logarithm of and the phase angle for RAP-blended binders at all aging times and RAP contents, regardless of asphalt and RAP sources.
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Acknowledgments
The authors gratefully acknowledge the Federal Highway Administration, U.S. Department of Transportation, for financial support of this project under contract No. DTFH61-07-D-00005. Special thanks are expressed to Dr. Jean Pascal Planche and Mr. Ron Glaser for their prereview and comments. Thanks are also expressed to Ms. Jenny Loveridge, Ms. Pamela Coles, and Mr. Gerald Forney for the sample preparation and data measurement, and to Ms. Jackie Greaser for preparation of the paper.
Disclaimer
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The U.S. 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 of the policy of the U.S. Department of Transportation. Mention of specific brand names of equipment does not imply endorsement by the U.S. Department of Transportation or Western Research Institute.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 966 - 973
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 8, 2013
Accepted: Jul 15, 2013
Published online: Jul 17, 2013
Discussion open until: Dec 17, 2013
Published in print: May 1, 2014
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