Gas permeability of partially hydrated geosynthetic clay liner under two stress conditions

M. A. Rouf, R. M. Singh, A. Bouazza, R. K. Rowe, W. P. Gates

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The results of a series of gas permeability tests, with monitoring of gravimetric/volumetric moisture content and total suction, on a commercially available needle-punched geosynthetic clay liner (GCL) are presented. GCL specimens were partially hydrated with deionised water under 2 and 20 kPa confinement prior to testing. The tests were conducted at differential pressures ranging from 1 to 10 kPa. Gas permeability was found to decrease with an increase in gravimetric/volumetric moisture content and a decrease of suction. The effect of the preconditioning stress was found to be more pronounced at gravimetric moisture contents greater than 40% (25% apparent degree of saturation, 0·30 m3/m3 volumetric moisture content), and suctions less than 1·6 MPa.
Original languageEnglish
Pages (from-to)325-333
Number of pages9
JournalEnvironmental Geotechnics
Issue number5
Publication statusPublished - Oct 2016

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