Precision Study for Dynamic Modulus Testing of Asphalt Concrete Using Independent Assurance Testing
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 3
Abstract
In this study, a precision study for dynamic modulus () testing is performed through independent assurance (IA) testing. The University of New Mexico (UNM) and AMEC Environment and Infrastructure, Inc. (AMEC) laboratories participated in this study. The precision and accuracy of the data are evaluated using -trend plots, coefficient of variation (COV), within-laboratory consistency (-statistic) plots, between-laboratory consistency (-statistic) plots, one-way analysis of variance (ANOVA), and repeatability and reproducibility studies. The -trend and mastercurve plots showed overlapping data at each temperature and loading frequency, suggesting no significant difference between the samples tested. Average COV values for UNM and AMEC laboratories were found to be 10 and 14%, respectively, which are acceptable for properly conducted testing. Average -statistic values of and 0.3 and average -statistic values of 0.8 and 1.0 were found for UNM and AMEC laboratories, respectively, which indicated very good precision and accuracy. One-way ANOVA showed no significant difference between the means of UNM and AMEC test results. The average ranges for UNM and AMEC laboratories were determined to be 12 and 15, which are well below the repeatability and reproducibility limits. Based on the statistical analysis of the independent assurance test data, it can be concluded that testing is precise and accurate.
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Acknowledgments
The authors would like to express their gratitude to the New Mexico State Department of Transportation (NMDOT) for supporting this study. Special thanks go to Jeff Mann (Head of Pavement Design, NMDOT), Virgil Valdez (Research Bureau, NMDOT), Robert McCoy (Head of Pavement Exploration, NMDOT), Parveez Anwar (State Asphalt Engineer, NMDOT), and Bob Meyers (Geotechnical Section Manager, NMDOT).
References
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© 2014 American Society of Civil Engineers.
History
Received: Jun 20, 2013
Accepted: Feb 19, 2014
Published online: Jul 18, 2014
Discussion open until: Dec 18, 2014
Published in print: Mar 1, 2015
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