Drainage and Mechanical Behavior of Highway Base Materials
Publication: Journal of Irrigation and Drainage Engineering
Volume 140, Issue 6
Abstract
The mechanical and drainage properties of graded aggregate base (GAB) materials used in mechanistic pavement design are the level one inputs. Several highway agencies need an evaluation of the stiffness and drainage characteristics of GAB stone delivered at highly variable gradations to construction sites. To fulfill the current need, the mechanical and drainage properties of seven GAB materials with varying petrography and physical properties were evaluated in the laboratory and field. The resilient modulus and hydraulic conductivity test results obtained in the laboratory were compared with the field measurements. The summary resilient moduli at optimum moisture content (OMC) were generally lower than those at OMC–2%; however, permanent deformations increased with the addition of moisture content. The correlation between the mean laboratory and field stiffness/modulus values was fair to acceptable ( to 0.94), and additional measurements may yield a stronger correlation. An increase in base thickness from 6 to 60 cm resulted in a 1.7 to 2.4 times decrease in drainage time depending on the analytical method used. The material cost decreased 1.6 times with a change in the drainage quality from poor to excellent or time-to-drain from 10 to 0.08 days. Similarly, a 2.4 times decrease in cost was noticeable with a layer coefficient increase from 0.08 to 0.14. The resilient modulus, permanent deformation, and hydraulic conductivity of GAB materials should be evaluated to design a highway base with adequate stiffness and drainage performance.
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Acknowledgments
This study was funded by the Maryland State Highway Administration (MDSHA) and the Scientific and Technological Research Council of Turkey (TUBITAK). The GABs used in the study were provided by several Maryland quarries. The findings and opinions in this study are solely those of the authors. Endorsement by the MDSHA, TUBITAK, or the GAB suppliers is not implied and should not be assumed. Partial fellowships provided to Dr. Kaya by Erciyes University and to Dr. Hatipoglu by the Technical University of Istanbul are acknowledged.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 140 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 3, 2013
Accepted: Dec 13, 2013
Published online: Feb 21, 2014
Published in print: Jun 1, 2014
Discussion open until: Jul 21, 2014
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