Calcium and Sodium Bentonite for Hydraulic Containment Applications
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 123, Issue 5
Abstract
The hydraulic conductivity of calcium and sodium bentonites was investigated for sand-bentonite mixtures, a thin bentonite layer simulating a geosynthetic clay liner (GCL), and bentonite-cement mixtures simulating backfill for a vertical cutoff wall. The permeant liquids were tap water and distilled water containing 0.25 M calcium chloride. In general, the hydraulic performance of calcium bentonite was not significantly better than the performance of sodium bentonite for either the clay-amended sand or the GCL application, and was substantially worse than the performance of sodium bentonite in the bentonite-cement mixture. A drained angle of internal friction of 21° was measured for calcium bentonite, compared to 10° for sodium bentonite. Except for a larger drained shear strength, no advantage of calcium bentonite over sodium bentonite could be identified from the results of this study.
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Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 123 • Issue 5 • May 1997
Pages: 438 - 445
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: May 1, 1997
Published in print: May 1997
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