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Assessment of bentonite compatibility with salinity using centrifugation-based water retention
journal contribution
posted on 2019-01-01, 00:00 authored by Andras Fehervari, Will GatesWill Gates, Abdelmalek Bouazza, Charles ShackelfordA generalized centrifugation-based water retention (CWR) test has been developed to evaluate the chemical compatibility of geosynthetic clay liner bentonites with different inorganic aqueous solutions of various types and ionic strengths of two salts, NaCl and CaCl2, and to serve as a surrogate for the standard swell index (SI) test. The intention of this study is to provide the industry and researchers with a powerful, robust, and accurate method that fulfills the same pre-screening role as the SI test but is more efficient, quantifiable, and reproducible. The steps to optimize the centrifugation-based test are reported and discussed, and the effects of various parameters (e.g., g level, centrifugal duration, ionic strength of inorganic salts, etc.) on the water retention characteristics of bentonite are analyzed and evaluated. In general, water retention of bentonites decreased with increasing salt loads and centrifugal forces. Centrifugal duration (30 min versus 60 min) had little to no effect on the measured CWR values. The CWR strongly correlated with SI for the same samples, enabling predictions of SI of Na-bentonite in weak to strong saline solutions.
History
Journal
Geotechnical testing journalVolume
42Issue
2Pagination
275 - 295Publisher
American Society for Testing and MaterialsLocation
Philadelphia, Penn.Publisher DOI
ISSN
0149-6115Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, ASTM InternationalUsage metrics
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No categories selectedKeywords
BentoniteCentrifugationChemical compatabilityGeosynthesisGeosynthesis clay linersInorganic salt solutionsSwell indexScience & TechnologyTechnologyPhysical SciencesEngineering, GeologicalGeosciences, MultidisciplinaryEngineeringGeologychemical compatibilitygeosyntheticsgeosynthetic clay linersHYDRAULIC CONDUCTIVITYELECTROLYTE CONCENTRATIONBARRIER PERFORMANCEPERMEABILITYEXCHANGESODIUMGCLSPERMEAMETERDESORPTION
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