Gas advection-diffusion in geosynthetic clay liners with powder and granular bentonites

Bouazza, A., Rouf, M. A., Singh, R. M., Rowe, R. K. and Gates, W. P. 2017, Gas advection-diffusion in geosynthetic clay liners with powder and granular bentonites, Geosynthetics International, vol. 24, no. 6, pp. 607-614, doi: 10.1680/jgein.17.00027.

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Title Gas advection-diffusion in geosynthetic clay liners with powder and granular bentonites
Author(s) Bouazza, A.
Rouf, M. A.
Singh, R. M.
Rowe, R. K.
Gates, W. P.ORCID iD for Gates, W. P.
Journal name Geosynthetics International
Volume number 24
Issue number 6
Start page 607
End page 614
Total pages 8
Publisher I C E Publishing
Place of publication London, Eng.
Publication date 2017-12
ISSN 1072-6349
Keyword(s) geosynthetics
gas diffusion
gas permeability
geosynthetic clay liners
Summary Gas diffusion and gas permeability tests were performed sequentially on powder and granular partially hydrated needle-punched geosynthetic clay liners (GCLs) over a range of gravimetric water content using a gas flow unified measurement system under 2 kPa and 20 kPa vertical stresses. Most of the changes in diffusion and advection occurred at intermediary levels of saturation or gravimetric water contents where diffusive and advective gas migration in the granular GCL tended to be higher than in the powder GCL. When the GCLs were relatively dry, their gas diffusion and gas permeability remained constant due to the large interconnected air voids present in the bentonites. For relatively wet conditions, the difference in their gas diffusion and gas permeability was minimal as the bentonites developed a relatively uniform gel structure. The results suggest that at a nominal overburden pressure of 20 kPa, GCLs such as the ones studied need to be hydrated to more than 160% gravimetric water content or >80% apparent degree of saturation before gas diffusion and permeability drop to 1.0×10-11m2/s and 2×10-13m/s, respectively.
Language eng
DOI 10.1680/jgein.17.00027
Field of Research 0905 Civil Engineering
0907 Environmental Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2017, Thomas Telford Ltd
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