Effect of Coarse Aggregate Morphology on Permanent Deformation Behavior of Hot Mix Asphalt
Publication: Journal of Transportation Engineering
Volume 132, Issue 7
Abstract
This paper defined a complete set of imaging based indices for different levels of coarse aggregate morphologies, i.e., the flat and elongated (FE) ratio, angularity index (AI), and surface texture (ST) index, and investigated their effects on permanent deformation behavior of hot mix asphalt (HMA). Image analyzed coarse aggregates were used to prepare eighteen Superpave HMA specimens using job mix formulas from ten State highway agencies and tested for permanent deformation at a specified high temperature. The permanent deformation data when linked to the morphological indices of the coarse aggregate, showed the best correlations with the ST index. The FE ratio demonstrated no measurable effects on the permanent deformation due to low percentage of flat and elongated particles used in the mixes. The influences of the AI and ST indices on the permanent deformation were especially significant when differences in the asphalt mix aggregate gradations were properly considered. A possible mechanism of coarse aggregate morphology affecting the stability and permanent deformation behavior of HMA was proposed in terms of particle geometrical interference in HMA.
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Acknowledgments
This paper is based on a pool funded-research project, TPF-5(023), conducted at the University of Illinois at Urbana-Champaign with the lead agency support of the Illinois Division of the Federal Highway Administration (FHwA) in Springfield, Ill. The writers would like to thank the late Mr. Pal Choudry, the project monitor from the FHwA Illinois Division; Mr. John D'Angelo, the project technical supervisor from the FHwA Turner-Fairbank Research Laboratory, and Mr. Charles Kotch, the contracting officer from the FHwA office in Washington, D.C. Our special thanks also go to the study partners and sponsors including the National Center for Asphalt Technology in Auburn, Ala.; the state highway agencies of Alabama, Georgia, Indiana, Minnesota, Mississippi, Missouri, Montana, and South Carolina; and the Central Federal Lands and Highway Division.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 132 • Issue 7 • July 2006
Pages: 580 - 589
Copyright
© 2006 ASCE.
History
Received: May 3, 2005
Accepted: Jul 24, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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