Practical Methodology of Determining the In Situ Dynamic (Complex) Moduli for Engineering Analysis
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 6
Abstract
The viscoelastic behavior of asphalt mixtures can be conveniently presented in the form of a stiffness master curve in various engineering applications. However, the methods to obtain the in-service mixture stiffness are limited to the falling weight deflectometer (FWD) testing and back-calculation procedure because the pavement layer thicknesses in many cases are too thin to allow laboratory testing. The test protocol to measure the axial dynamic modulus requires cylindrical specimens with a height-to-diameter ratio higher than 2, while the cores need to be at least thick for measuring shear stiffness. This technical note describes and compares the methods for constructing asphalt mixture master curves utilizing stiffness predictive equations for asphalt binders and mixtures, in addition to using laboratory measurements, as an alternative to FWD backcalculation analysis. This technical note also recommends constraining the low and high mixture stiffness values measured from simple shear testing to obtain stiffness comparable to the uniaxial dynamic modulus testing.
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Acknowledgments
This work was supported by the Joint Transportation Research Program of Indiana Department of Transportation (INDOT) and Purdue University. The contents of this technical note reflect the views of the writers, who are responsible for the facts and the accuracy of the data presented herein and do not necessarily reflect the official views or policies of the Federal Highway Administration and the Indiana Department of Transportation, nor do the contents constitute a standard, specification, or regulation. The work reported herein was conducted in conjunction with Joint Transportation Research Program Project No. SPR-2788, which was a study for evaluation of surface (top–down) longitudinal wheel path cracking in Indiana. The rheological analysis tools and encouragement and constructive feedback from Dr. Geoff Rowe and Mr. Mark Sharrock (Abatech, Inc.) are gratefully acknowledged. The support of the Study Advisory Committee Members of this project was also greatly appreciated, as well as INDOT for obtaining the materials and providing pavement information and the North Central Superpave Center for the material testing.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 6 • June 2007
Pages: 508 - 514
Copyright
© 2007 ASCE.
History
Received: May 17, 2005
Accepted: Sep 18, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Eyad Masad
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