Towards a Mechanistic Understanding of Moisture Damage in Asphalt Concrete
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 3
Abstract
Recently, dynamic modulus () test has gained substantial acceptance for Superpave mix performance evaluation and in designing asphalt pavements for rutting and fatigue cracking. Mechanistic empirical pavement design guide (MEPDG currently branded as AASHTOW are ME pavement design) is currently the state-of-the-art method of designing asphalt pavements and it utilizes data. Unfortunately, neither Superpave mix design method nor ME pavement design has used to evaluate asphalt concrete (AC) moisture damage. Though based rut and fatigue models are available in ME pavement design, there has not been any model for moisture damage of AC. To this end, this study attempts to correlate with moisture damage as a first step to moving toward mechanistic understanding. Moisture-induced sensitivity tester (MIST) is used for moisture conditioning of asphalt samples. Moisture damage resulting from MIST conditioning is evaluated using the dynamic modulus ratio (DMR) of wet to dry samples. MIST conditioning is found to decrease the value of asphalt concrete (AC) indicating the presence of moisture damage. Moreover, moisture damage shows an increasing trend with increasing MIST-conditioning number of cycles, temperatures, and pressures. To capture the correlation between DMR with MIST-conditioning cycles and pressures, two different models are developed. The coefficient of determination and are obtained for the MIST-cycle and MIST-pressure models. It is hoped that these models are incorporated in the ME pavement design in future.
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Acknowledgments
The New Mexico Department of Transportation (NMDOT) funded this study. The authors would like to express their sincere gratitude and appreciation to Jeff Mann, Pavement Design Section Head of NMDOT, for being the advocate of this project and his regular support, sponsorship, and suggestions. The authors appreciate the valuable service and time of the Project Manager, Mr. Virgil Valdez, for this project. Special thanks go to several Project Panel members namely, Robert McCoy, Pavement Exploration Section Head, NMDOT Materials Bureau; Parveez Anwar, State Asphalt Engineer; and Bob Meyers, previously Materials Bureau Chief and currently, Geotechnical Section Manager, NMDOT Materials Bureau.
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© 2014 American Society of Civil Engineers.
History
Received: Nov 22, 2013
Accepted: Feb 12, 2014
Published online: Jul 17, 2014
Discussion open until: Dec 17, 2014
Published in print: Mar 1, 2015
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