In-Place Stabilization of Pond Ash Deposits by Hydrated Lime Columns
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 12
Abstract
Abandoned coal ash ponds cover up vast stretches of precious land and cause environmental problems. Application of suitable in situ stabilization methods may bring about improvement in the geotechnical properties of the ash deposit as a whole, converting it to a usable site. In this study, a technique of in-place stabilization by hydrated lime columns was applied to large-scale laboratory models of ash ponds. Samples collected from different radial distances and different depths of the ash deposit were tested to study the improvements in the water content, dry density, particle size distribution, unconfined compressive strength, pH, hydraulic conductivity, and leachate characteristics over a period of one year. The in-place stabilization by lime column technique has been found effective in increasing the unconfined compressive strength and reducing hydraulic conductivity of pond ash deposits in addition to modifying other geotechnical parameters. The method has also proved to be useful in reducing the contamination potential of the ash leachates, thus mitigating the adverse environmental effects of ash deposits.
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Acknowledgments
The research work reported in this paper was conducted in the Department of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal, India where the first and second writers have been research scholar and professor, respectively, until recently. The writers acknowledge the financial support received under the Quality Improvement Program of the Ministry of Human Resource Development, Government of India.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 12 • December 2007
Pages: 1609 - 1616
Copyright
© 2007 ASCE.
History
Received: Jun 22, 2005
Accepted: Jan 11, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
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