Use of Standard and Off-Spec Fly Ashes for Soil Stabilization
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 2
Abstract
There has been significant utilization of standard fly ashes, Class C and Class F fly ashes, in the cement industry and in soil stabilization applications. However, the majority of the fly ashes that do not satisfy the chemical standards [off-specification (off-spec) fly ashes] have been disposed in landfills because of their unfavorable chemical properties such as high carbon content or high content. In this study, a clay soil was stabilized with different proportions of the standard and off-spec fly ashes. A series of unconfined compression (UC) tests were conducted on the specimens that were prepared to observe the suitability of the off-spec fly ashes for soil stabilization. The test results indicated that the off-spec fly ashes showed superior performance compared with the standard fly ashes due to their high CaO contents regardless of their and contents. It was recommended that chemical- and performance-based standards should be used instead of only chemical-based standards to determine whether a selected fly ash is suitable for soil stabilization.
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Acknowledgments
The authors would like to thank Aydin Gokce, from the Department of Civil Engineering at Gazi University, and Osman Yilmaz, a graduate student, for their help in performing the laboratory study.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 4, 2018
Accepted: Aug 8, 2018
Published online: Dec 4, 2018
Published in print: Feb 1, 2019
Discussion open until: May 4, 2019
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