Effect of Shape Parameters and Gradation on Laboratory-Measured Permeability of Aggregate Bases
Publication: International Journal of Geomechanics
Volume 15, Issue 4
Abstract
The current study was undertaken to evaluate the effect of aggregate shape parameters (i.e., angularity, sphericity, form, and texture) and gradation on the permeability of commonly used aggregate bases in Oklahoma. Aggregates used in this study were collected from three different quarries. For each aggregate type, upper and lower limits of three different gradations, modified AASHTO #57, Oklahoma Aggregate Association (OKAA) Type M, and Oklahoma DOT (ODOT) Type A, were selected. Permeability of 18 different combinations of aggregate types and gradations () were tested using a falling-head permeability approach. For a selected gradation, the lower limit exhibited higher permeability values than the upper limit. Also, permeability was found to increase with an increase in effective diameter and void ratio. An increased coefficient of uniformity and fine content resulted in lower permeability, as expected. Furthermore, the shape parameters of different aggregate types were measured using an aggregate imaging system (AIMS). The coefficient of permeability was found to increase with reduced gradient angularity and increased sphericity. The texture index was found to have minimal impact on the coefficient of permeability. A regression model was developed using aggregate shape and gradation parameters to estimate permeability of aggregate bases.
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Acknowledgments
This paper is based on the partial results from ODOT SPR Item: 2196, “Stability and Permeability of Proposed Aggregate Bases in Oklahoma.” The research team is specifically thankful to Jeff Dean, Dawn Sullivan, Scott Cosby, Vincent Reidenbach, Chris Clarke, and Ginger McGovern from the Oklahoma DOT and Jim Rodriguez from the Oklahoma Aggregate Association for their assistance in this project. The authors would also like to extend their acknowledgment to Dr. Naji Khoury, former assistant professor at Temple University, for his active support throughout this project.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 15 • Issue 4 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 21, 2013
Accepted: Feb 28, 2014
Published online: May 29, 2014
Published in print: Aug 1, 2015
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