Empirical Correlation of Permanent Deformation Tests for Evaluating the Rutting Response of Conventional Asphaltic Concrete Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
Rutting or permanent deformation is one of the severe distresses manifested in flexible pavements caused by the various mechanisms such as densification, lateral plastic flow, and/or loss of materials under wheel path due to repeated heavy traffic loads. Various laboratory tests have been devised to determine the rutting propensity and to optimize the field performance of hot mix asphalt (HMA) mixtures as a part of the HMA mix and structural design processes. Although various approaches exist to predict the permanent deformation of HMA, this study develops a relationship of flow number (FN), dynamic modulus (DM), and uniaxial repeated-load permanent deformation (RLPD) to enable the trade-off analysis among them. Also, a novel parameter, FN index, is explored and used to determine the rutting potential of HMA mixtures. Twelve globally practiced HMA mixtures are investigated with three different performance grade binders and single limestone aggregate source. Superpave gyratory compacted specimens are subjected to performance testing (FN, DM, and RLPD) and results indicate a strong correlation of FN index with DM and exhibit better correspondence than the traditional FN (cycles) parameter.
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Acknowledgments
This research was sponsored by National Highway Authority (NHA) through the Highway Research and Training Center (HRTC) and was part of rthe esearch project titled “Improvement of asphalt mix design technology for Pakistan” under a collaboration agreement with the National University of Sciences and Technology (NUST). The technical support and financial assistance provided by staff and officials of NHA, HRTC, and NUST are hereby acknowledged. The authors were grateful for two anonymous reviewers’ insightful comments.
Disclaimer
The contents of this paper reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein and do not necessarily reflect the official views or policies of any agency or institute. This paper does not constitute a standard or specification, nor is it intended for design, construction, bidding, contracting, tendering, or permit purposes.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 31, 2016
Accepted: Nov 11, 2016
Published ahead of print: Mar 30, 2017
Published online: Mar 31, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 31, 2017
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