Volume Change Behaviors of Expansive Soils Stabilized with Recycled Ashes and Fibers
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VIEW THE REPLYPublication: Journal of Materials in Civil Engineering
Volume 18, Issue 2
Abstract
In this paper, class F fly ash, bottom ash, polypropylene fibers, and nylon fibers were evaluated as potential stabilizers in enhancing volume change properties of sulfate rich expansive soils. As a part of the research evaluation, a comprehensive laboratory experimental program was designed and conducted on two different subgrade soils from two locations in Texas. Four dosage levels of each stabilizer, two compaction moisture content levels, and 14 days curing period were investigated. Volume change behavioral tests including volumetric free swell, volumetric shrinkage strain, and vertical swell pressure tests were conducted on both isolated stabilizer treated and combined ash-fiber stabilized soils. Ash stabilizers showed improvements in reducing swelling, shrinkage, and plasticity characteristics by 20–80% whereas fibers treatments resulted in varied improvements. In combined treatments, class F fly ash mixed with nylon fibers was the most effective treatment on both Dallas and Arlington soils, where the soil property enhancements were considered average-to-moderate. Possible mechanisms that resulted in the soil property improvements are discussed along with the recommended stabilizers and their dosages for expansive soil treatments.
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Acknowledgments
This study was financially supported by the Advanced Technology Program (ATP) of Texas Higher Education Coordinating Board, Austin, Tex. under Grant No. 1407610-50. The writers would like to acknowledge this financial support. The writers would also like to thank Boral Material Technologies, Inc. for providing fly ash and bottom ash stabilizers used in this research.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 2 • April 2006
Pages: 295 - 306
Copyright
© 2006 ASCE.
History
Received: Feb 11, 2005
Accepted: Jul 29, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
Notes
Note. Associate Editor: Hilary I. Inyang
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