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Gas flow unified measurement system for sequential measurement of gas diffusion and gas permeability of partially hydrated geosynthetic clay liners
journal contribution
posted on 2016-06-01, 00:00 authored by M A Rouf, A Bouazza, R M Singh, Will GatesWill Gates, R K RoweA gas flow unified measurement system (UMS-G) for sequential measurement of gas diffusion and gas permeability of geosynthetic clay liners (GCLs) under applied stress conditions (2 to 20 kPa) is described. Measurements made with the UMS-G are compared with measurements made with conventional experimental devices and are found to give similar results. The UMS-G removes the need to rely on two separate systems and increases further the reliability of the gas properties’ measurements. This study also shows that the gas diffusion and gas permeability reduce greatly with the increase of both gravimetric water content and apparent degree of saturation. The effect of applied stress on gas diffusion and gas permeability is found to be more pronounced at gravimetric water content greater than 60%. These findings suggest that at a nominal overburden stress of 20 kPa, the GCL used in the present investigation needs to be hydrated to 134% gravimetric water content (65% apparent degree of saturation) before gas diffusion and gas permeability drop to 5.5 × 10−11 m2·s−1 and 8.0 × 10−13 m·s−1, respectively, and to an even higher gravimetric water content (apparent degrees of saturation) at lower stress.
History
Journal
Canadian geotechnical journalVolume
53Issue
6Pagination
1000 - 1012Publisher
NRC Research PressLocation
Ottawa, Ont.Publisher DOI
ISSN
0008-3674eISSN
1208-6010Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2016, NRC Research PressUsage metrics
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No categories selectedKeywords
Science & TechnologyTechnologyPhysical SciencesEngineering, GeologicalGeosciences, MultidisciplinaryEngineeringGeologygeosynthetic clay linergas flowdiffusionadvectiongravimetric water contentHYDRAULIC CONDUCTIVITYOXYGEN DIFFUSIONPOROUS-MEDIAGASEOUS-DIFFUSIONCATION-EXCHANGECOMPOSITE LINERGCLPERFORMANCETAILINGSCOVERS
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