Hydraulic performance of geosynthetic clay liners to sulfuric acid solutions

Liu, Y., Bouazza, A., Gates, W. P. and Rowe, R. K. 2015, Hydraulic performance of geosynthetic clay liners to sulfuric acid solutions, Geotextiles and geomembranes, vol. 43, no. 1, pp. 14-23, doi: 10.1016/j.geotexmem.2014.11.004.

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Title Hydraulic performance of geosynthetic clay liners to sulfuric acid solutions
Author(s) Liu, Y.
Bouazza, A.
Gates, W. P.ORCID iD for Gates, W. P. orcid.org/0000-0001-7388-0289
Rowe, R. K.
Journal name Geotextiles and geomembranes
Volume number 43
Issue number 1
Start page 14
End page 23
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-02
ISSN 0266-1144
Summary The ability of geosynthetic clay liners (GCLs) to contain acidic mining leachates is examined. The results of saturated hydraulic conductivity (k) of two GCLs permeated with sulfuric acid solutions (H2SO4) at 0.015M, 0.125M and 0.5M concentrations are reported. Also, the saturated k values of consolidated (35kPa) bentonite cakes made from sodium bentonite extracted from both GCLs were compared to a commonly used magnesium-sodium form bentonite. Chemical compatibility and effects of pre-hydration and effective stress were assessed as part of this study. Results indicated that an increased acid concentration (ionic strength) increased the k of all tested specimens. The ratio of the k0.5 values for non-prehydrated specimens permeated with 0.5M H2SO4 to the kw values for specimens permeated with deionized (DI) water (k0.5/kw) ranged from 10 to 110. Pre-hydration (50-140% water content) and increased effective stress (35-200kPa) improved the performance of GCLs (lower k). Strong correlations were observed between k and liquid limit and swell index parameters independent of pre-hydration and effective stress in this study. However, care should still be taken when using these correlations to evaluate hydraulic performance because the intrinsic micro-structure properties of bentonite, such as porosity, should also be considered. This work showed that, for example, high SI of bentonite does not translate necessarily to a better hydraulic performance of GCLs.
Language eng
DOI 10.1016/j.geotexmem.2014.11.004
Field of Research 090501 Civil Geotechnical Engineering
0905 Civil Engineering
Socio Economic Objective 960908 Mining Land and Water Management
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30086972

Document type: Journal Article
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