Smoothing Asphalt Concrete Complex Modulus Test Data
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 5
Abstract
A computational approach is offered for smoothing asphalt concrete complex modulus test results in a way that forces compliance with linear viscoelastic theory and thermorheological simplicity. Essentially, it is based on presupposing the shape of the relaxation spectrum with calculations carried out in the wicket domain. The suggested scheme calls for the determination of six free parameters—three of which are associated with the mechanical (viscoelastic) response, while the remaining three are related to the time-temperature shifting properties and include (as unknown) the reference temperature level. In the evaluation process, it is shown how the first three parameters can be obtained directly from the measurements and separately from the other three, while the determination of the latter set follows as a second independent step. This decoupled process simplifies the analysis and includes additional advantages. In this paper, the smoothing approach is described and discussed, and its appropriateness and relevancy for asphalt concrete materials is demonstrated using a sample data set.
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Acknowledgments
This work was partially supported by the Henry Ford II Transportation Research Fund. The writer would also like to thank the North Central Superpave Center at Purdue University for providing access to the complex modulus data set used herein.
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Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 5 • May 2011
Pages: 606 - 611
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 15, 2009
Accepted: Oct 26, 2010
Published online: Oct 28, 2010
Published in print: May 1, 2011
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