Stochastic Estimation of the In-Place Dynamic Modulus for Asphalt Concrete Pavements
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 6
Abstract
The dynamic modulus of asphalt concrete mixtures is a key property in assessing asphalt pavement performance based on its role in the mechanistic-empirical design method. The dynamic modulus is also considered to be used as one of the major characteristics in performance-related specifications for quality assurance. However, no feasible method to estimate the mean and variance of the in-place dynamic modulus for the as-built asphalt pavement has been suggested. This paper presents a methodology of stochastically evaluating the in-place dynamic modulus of the as-built asphalt pavement using a relationship of in-place air voids and a set of single dynamic modulus values measured in the laboratory. The methodology was validated with asphalt mix collected from a construction site. The comparison plot between the estimated in-place dynamic modulus and as-designed asphalt mix demonstrated a simple way to evaluate the as-built mix quality. This methodology provides several practical advantages to determine the quality of as-built mix compared with that of as-designed mix in terms of the dynamic modulus. In addition, the methodology envisions the possibility of incorporating the dynamic modulus into performance-related specifications.
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Acknowledgments
The work described in this paper was conducted as part of NCHRP 9-22A, Evaluation of the Quality-Related Specification Software Version 1.0. The authors acknowledge that the study was conducted under the general supervision of M. W. Witczak and James Moulthrop of Fugro Consultants, Inc. The authors are also grateful for the support received from Utah Department of Transportation.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 23, 2013
Accepted: Jun 5, 2014
Published online: Aug 12, 2014
Discussion open until: Jan 12, 2015
Published in print: Jun 1, 2015
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