Materials and Temperature Effects on the Resilient Response of Asphalt-Treated Alaskan Base Course Materials
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 2
Abstract
Asphalt-treated bases (ATBs) are the most commonly used type of stabilized layer in Alaska because of locally available asphalt resources and its relatively lower cost. As an essential material input parameter for pavement design, resilient modulus of ATBs has been studied in laboratory evaluations, field investigations, and empirical and mechanistic modeling. However, most ATBs’ values available in the database of the Alaska flexible pavement design software were obtained from in-service roadways through nondestructive testing and back calculation. Therefore, there was a need to characterize these stabilized materials by taking into account the main factors that influence their engineering behavior. In this study, the characterization of two types of ATBs was achieved through laboratory testing: hot asphalt-treated base (HATB) and foamed asphalt-treated base (FATB). The effects of loading amplitude, confining pressure, temperature, binder content, and aggregate source and properties on the resilient behaviors of HATB and FATB were investigated. Testing results were discussed and used to develop stress-dependent equations for both HATB and FATB that can be incorporated in current pavement design procedures. The effects of temperature and material variables were correlated to regression constants of the equations.
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Acknowledgments
The research presented in this paper was part of a study on the characterization of asphalt-treated base materials sponsored by the Alaska DOT and Public Facilities (AKDOT and PF) and the Alaska University Transportation Center (AUTC). The writers gratefully acknowledge AKDOT and PF and AUTC for the financial support. The opinions expressed in this paper are that of the writers and do not represent the views of AKDOT and PF nor AUTC.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 2 • February 2011
Pages: 161 - 168
Copyright
© 2011 ASCE.
History
Received: Feb 2, 2010
Accepted: Jul 2, 2010
Published online: Jan 14, 2011
Published in print: Feb 2011
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