Behavior of Stabilized Subgrade Soils under Indirect Tension and Flexure
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
A laboratory study was undertaken to evaluate the influence of three cementitious additives on the indirect tensile and fatigue behavior of two subgrade soils. Hydrated lime (or lime), class C fly ash (CFA), and cement kiln dust (CKD) were used as additives. Cylindrical specimens were prepared, cured for 28 days, and subjected to different stress sequences in indirect tension to study the resilient modulus. Moreover, stabilized beam specimens were subjected to repeated cycles of reloading-unloading after 28 days of curing in a four-point beam fatigue apparatus for evaluating fatigue life and flexural stiffness. These properties were compared with those of the control soil specimens in order to determine the extent of enhancement. Results indicate that all three additives improved the indirect tensile and fatigue properties; however, the degree of improvement varied with the type of additive and soil. The properties evaluated under indirect tension mode projected 10 percent CKD with highest improvement after 28 days of curing, while evaluation under flexure mode showed 6 percent lime providing maximum enhancements in fatigue life. The properties evaluated in this study are expected to provide a better understanding of the performance of a stabilized subgrade layer in a mechanistic sense.
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Acknowledgments
The authors are thankful to the Oklahoma Department of Transportation (ODOT) for providing funds for this project.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 833 - 844
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 10, 2012
Accepted: Jun 5, 2013
Published online: Jun 7, 2013
Discussion open until: Nov 7, 2013
Published in print: May 1, 2014
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