Effects of Temperature on Creep Behavior of Compacted Recycled Asphalt Pavement
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 4
Abstract
Recycled asphalt pavement (RAP) can be beneficially used as alternative construction material in geotechnical applications, but characterizing its creep response is important to account for potential viscous effects attributable to the material’s asphalt content. Effects of elevated temperature (35 and 50°C) on creep behavior of compacted RAP specimens were investigated through temperature-controlled triaxial compression tests at sustained deviator stresses. RAP compacted at room temperature (22°C) and subjected to deviator stress at elevated temperature showed creep strain and strain rate that systematically increased with increasing temperature. Time to creep rupture decreased with increasing temperature. Compaction at elevated temperature resulted in denser specimens and reduced creep strain and strain rate. Temperature effects were incorporated into a creep model that may be used to estimate strain rate of RAP at elevated temperatures. Construction of structural fills containing RAP is recommended during warm months of the year to minimize subsequent creep strain and potential for creep rupture.
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Acknowledgments
The authors are very grateful to the Recycled Materials Resource Center and Solid Waste Research Program at the University of Wisconsin-Madison for providing funding for this research. The first author is also thankful for the support of the Jiangsu Government Scholarship for Overseas Studies (JS-2013-092) and the NSFC (41402251, 51478209). The authors also thank Payne and Dolan, Inc., for providing the RAP samples.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 4 • April 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Nov 19, 2015
Accepted: Aug 23, 2016
Published online: Oct 31, 2016
Discussion open until: Mar 31, 2017
Published in print: Apr 1, 2017
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