Effect of Wet–Dry Cycles and Cation Exchange on Gas Permeability of Geosynthetic Clay Liners
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 8
Abstract
A series of gas permeability tests were performed on a partially hydrated needle punched geosynthetic clay liner (GCL) after exposure to wet–dry cycles and ion exchange. To be able to evaluate the effect of wetting and drying cycles combined with the effect of cation exchange, three sets of GCL samples were prepared with different types of hydrating liquid. The first set of GCL samples was hydrated with de-ionized water, which formed a baseline test series. The second and third sets were hydrated with 0.0125 and calcium chloride solutions, respectively. All three sets of GCL samples were subjected to multiple wetting and drying cycles before undergoing gas permeability tests. Gas permeability of the GCL, hydrated with calcium chloride solution, was found to be approximately one order of magnitude higher than that of the GCL hydrated with de-ionized water, whereas gas breakthrough flow was observed for all but the first wetting cycle on GCLs hydrated with the stronger calcium chloride solution.
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Acknowledgments
This study was financially supported by a Discovery grant awarded to the first writer by the Australian Research Council to investigate gas migration through GCLs. Sincere appreciation is extended to the Council. The GCL samples were donated by Soil Filters Pty. Ltd and Geofabrics Australasia Pty. Ltd. Their support is gratefully acknowledged. The writers are very grateful to the anonymous reviewers for their detailed review of the paper and their comments.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 8 • August 2006
Pages: 1011 - 1018
Copyright
© 2006 ASCE.
History
Received: Apr 8, 2005
Accepted: Mar 7, 2006
Published online: Aug 1, 2006
Published in print: Aug 2006
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