Postprocessing Method for Dynamic Modulus Tests of Hot-Mix Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 7
Abstract
The main objectives of this study are: (1) to develop a postprocessing method for analyzing the dynamic modulus test of compacted asphalt mixtures; (2) to identify optimum regression equations for the compressive stress and its corresponding strains in a dynamic modulus test using this method; and (3) to evaluate the accuracy of the proposed method compared with the method in the current equipment specification. Including the procedure used in the current equipment specifications, two procedures for fitting the dynamic stresses and three procedures for fitting the corresponding strains were employed in the postprocessing method. The coefficients of the regression equations in the five procedures were used to determine the dynamic modulus and phase angle. Uniaxial compressive dynamic modulus tests of 10 asphalt mixtures were conducted at five temperatures and six frequencies with Universal Test Machine (UTM). A total of 1,800 test results were processed with the procedures in the proposed method. On basis of the standard errors of the least square fit, the procedures in the postprocessing method were evaluated. It was found that the procedure in the equipment specification was inaccurate to fit the strains, especially at the higher temperatures and low frequencies. Therefore, correction coefficients were recommended for the measured dynamic modulus and phase angle from the currently used UTM. The potential application of the proposed method is significant since it will improve the degree of accuracy of the dynamic modulus values used in the mechanistic-empirical pavement design procedure.
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Acknowledgments
The research work was partially sponsored by the Federal Highway Administration through Michigan Department of Transportation. The writers appreciate the guidance and involvement of John Barak of the Michigan Department of Transportation as the Project Manager. Testing was completed in Center of Excellence for Transportation Materials at Michigan Tech. This paper is also partially funded by the National Science Foundation under Grant No. NSF0701264. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers’ and do not necessarily reflect the views of any agencies.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 7 • July 2010
Pages: 658 - 666
Copyright
© 2010 ASCE.
History
Received: Dec 14, 2008
Accepted: Oct 27, 2009
Published online: Nov 12, 2009
Published in print: Jul 2010
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