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Thermal conductivity of geosynthetic clay liners
journal contribution
posted on 2016-09-01, 00:00 authored by M A Ali, A Bouazza, R M Singh, Will GatesWill Gates, R K RoweThe thermal conductivities of powdered and granular bentonite based needle punched geosynthetic clay liners (GCLs) were investigated at different gravimetric water contents under 25, 50, 75, and 100 kPa vertical stresses. Both types of GCLs exhibited an increase in thermal conductivity with increasing vertical stress at all water contents. The effect of vertical stresses was more pronounced for the specimens hydrated at lower gravimetric water contents and this was attributed to their high initial volumetric air content. The variability of water distribution in partially hydrated GCLs has been identified as a factor that may affect their thermal conductivity. The forms of bentonites (i.e., powder or granular) affected their thermal conductivities; however, this effect was less apparent at higher gravimetric water contents due to the reduced air content and gel formation in the bentonites. Finally, the GCL thermal conductivity calculated from the measured thermal conductivities of its various constituents (i.e geotextile and bentonite) components differed from the measured values. This was attributed to the nonuniform water distribution across the GCL specimen and change in material properties when components of GCL were disassembled.
History
Journal
Canadian geotechnical journalVolume
53Issue
9Pagination
1510 - 1521Publisher
NRC Research PressLocation
Ottawa, Ont.Publisher DOI
ISSN
0008-3674eISSN
1208-6010Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2016, Canadian Science Publishing.Usage metrics
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No categories selectedKeywords
Science & TechnologyTechnologyPhysical SciencesEngineering, GeologicalGeosciences, MultidisciplinaryEngineeringGeologygeosynthetic clay linerthermal conductivityvertical stressgravimetric water contentHYDROMECHANICAL BEHAVIORSWELLING BEHAVIORGAS-PERMEABILITYHEAT-GENERATIONWATER-RETENTIONCOMPOSITE LINERPERFORMANCEGCLCOMPATIBILITYGEOMEMBRANES
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