Characterization of Permanent Deformation Using AMPT Repeated-Load-Triaxial and RSCH Tests for Mechanistic-Empirical Design and Practical Considerations
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 12
Abstract
Caltrans is currently implementing a California version of the superior performing asphalt pavements (Superpave) mix design procedure for hot-mix asphalt (HMA) to replace the long been used Hveem mix design process, and is interested in including performance-related tests for mix design and quality assurance. The objective of this study was to compare the repeated load triaxial (RLT) rutting test using the asphalt mixture performance tester (AMPT) and the repeated shear test at constant height (RSCH) using repeated simple shear tester (RSST) for characterization for Caltrans mechanistic-empirical (ME) pavement design in terms of usefulness of the results, difficulty, and time required to obtain results. The results indicated that there is potential to use the unconfined RLT test as a substitute for the RSCH test for mix design and quality assurance, and to use the confined or unconfined RLT for ME characterization. However, the preliminary results regarding shift factors to convert results from RLT to RSCH to make use of previously calibrated models need more comprehensive evaluation.
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Acknowledgments
This paper describes research activities that were requested and sponsored by the California Department of Transportation (Caltrans) Division of Research, Innovation, and System Information. Caltrans sponsorship and interest is gratefully acknowledged. The contents of this paper reflect the views of the authors and do not necessarily reflect the official views or policies of the State of California or the Federal Highway Administration. The authors are grateful to James Signore for advising the Superpave implementation in California project. The authors would also like to thank David Eng, Oscill Maloney, Randy Gee, and Roger Cheng for their help with material collection, specimen preparation, and fabrication.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 7, 2016
Accepted: May 12, 2016
Published online: Jul 19, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 19, 2016
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