Maxwell Model Analysis of Bitumen Rheological Data
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 10
Abstract
Maxwell models have been parameterized on the basis of rheological data from the literature for bitumens used in pavements to relate differences in rheology to underlying differences in mechanical relaxation times. The data employed were previously measured for bitumens without aging, with rolling thin-film oven (RTFO) aging, and with subsequent pressure aging vessel (PAV) aging. Bitumens in different data sets included different types of bitumen modification. Full time-temperature superposition was applied, with horizontal shift factors based on achieving superposition of phase angle tangent () and vertical shift factors determined based on overlap of storage and loss moduli. The results determined for the horizontal shift factor followed the Williams-Landel-Ferry equation with parameters that differed for each bitumen. Dynamic modulus data were represented by using a series of discrete Maxwell models. Fand suggested a continuous yet asymmetric distribution of relaxation times on a logarithmic time axis. PAV-aged bitumens showed increased modulus contributions at longer relaxation times than RTFO-aged bitumens.
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Acknowledgments
Professor Mihai O. Marasteanu is thanked for providing access to his raw data. Financial support is gratefully acknowledged from the Rhode Island Department of Transportation (Research and Technology Division), the URI Transportation Center, and the Transportation Center, and the Asphalt Research Consortium of the Federal Highway Administration (contract FHADTFH61-07-H- 00009) through a subcontract from the Western Research Institute.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 10 • October 2011
Pages: 1387 - 1395
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 2, 2010
Accepted: Apr 5, 2011
Published online: Apr 7, 2011
Published in print: Oct 1, 2011
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