Anisotropic Aggregate Base Inputs for Mechanistic Pavement Analysis Considering Effects of Moving Wheel Loads
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 5
Abstract
A new methodology is presented in this paper for determining cross-anisotropic aggregate base properties, i.e., directional dependency of moduli and Poisson’s ratios, as inputs into mechanistic pavement analysis considering effects of actual traffic or moving wheel loading. The proposed materials characterization requires conducting constant stress path triaxial tests and incrementally varying loading stress path slopes at similar stress states that are representative of various moving wheel loading conditions in the laboratory. In accordance, cross-anisotropic aggregate properties are determined by varying slightly the stress path slopes during testing and then by employing an error minimization approach to interpret the test results. Crushed aggregate specimens were prepared and tested to obtain cross-anisotropic properties at five different stress path slopes representative of various moving wheel load induced compression and extension type pavement stress states. Vertical resilient moduli were commonly found to be larger than horizontal ones and critically low resilient moduli were also obtained for some extension states. The findings point to advances needed in granular materials characterization such as incorporating anisotropic and stress dependent behavior into mechanistic pavement analysis and properly considering the effects of moving wheel loading on pavement response.
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Acknowledgments
This paper was prepared from a study conducted at the Center of Excellence for Airport Technology. Funding for the Center of Excellence is provided in part by the Federal Aviation Administration under Research Grant No. UNSPECIFIED95-C-001. The Center of Excellence is maintained at the University of Illinois at Urbana-Champaign in partnership with Northwestern University and the Federal Aviation Administration. Ms. Patricia Watts is the FAA Program Manager for Air Transportation Centers of Excellence and Dr. Satish Agrawal is the FAA Airport Technology Branch Manager. The contents of this paper reflect the views of the writers who are responsible for the facts and accuracy of the data presented within. The contents do not necessarily reflect the official views and policies of the Federal Aviation Administration. This paper does not constitute a standard, specification, or regulation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 5 • October 2005
Pages: 505 - 512
Copyright
© 2005 ASCE.
History
Received: Mar 23, 2004
Accepted: Sep 7, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
Notes
Note. Associate Editor: Kamran M. Nemati
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