Field Verification of Superpave Dynamic Modulus
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 5
Abstract
In the mechanistic-empirical pavement design guide, prediction of flexible pavement response and performance needs an input of dynamic modulus of hot-mix asphalt at all three levels of hierarchical inputs. This study was intended to find the best way to predict/derive this input. Nine Superpave pavement sections were selected as test sections in this study. Deflection data on all test sections was collected with a Dynatest 8000 falling weight deflectometer shortly after construction. The deflection data, normalized with respect to 40-kN load, were used to back-calculate asphalt layer moduli using three back-calculation algorithms. Laboratory dynamic modulus tests were conducted on asphalt concrete (AC) cores and laboratory-compacted samples. Dynamic modulus was also estimated with the Witczak model, new Witczak model, and Hirsch model. The results show that the AC moduli obtained from various back-calculation programs used in the study are generally comparable. Laboratory dynamic modulus is comparable at , but the variation increases as the test temperature increases. The Witczak model underestimates the dynamic modulus at low temperature and overestimates it at higher temperature. The parameter estimate when the laboratory dynamic modulus is used as a dependent variable and the moduli from other approaches as independent variables is close to 1. This is especially true for the AC moduli estimated by various prediction methods. The Hirsch model appears to be the best for estimation and is closely followed by the new Witczak model.
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Acknowledgments
The writers would like to thank KDOT for sponsoring this study. The writers gratefully acknowledge the help of Mr. Cristian Dumitru, formerly with Kansas State University, in dynamic modulus testing for most projects.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 5 • May 2010
Pages: 485 - 494
Copyright
© 2010 ASCE.
History
Received: Jan 2, 2009
Accepted: Sep 5, 2009
Published online: Oct 2, 2009
Published in print: May 2010
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