Potential hydraulic barrier performance of cyclic organic carbonate modified bentonite complexes against hyper salinity

Fehervari, A., Gates, Will P., Patti, A. F., Turney, T. W., Bouazza, A. and Rowe, R. K. 2016, Potential hydraulic barrier performance of cyclic organic carbonate modified bentonite complexes against hyper salinity, Geotextiles and geomembranes, vol. 44, no. 5, pp. 748-760, doi: 10.1016/j.geotexmem.2016.06.002.

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Title Potential hydraulic barrier performance of cyclic organic carbonate modified bentonite complexes against hyper salinity
Author(s) Fehervari, A.
Gates, Will P.ORCID iD for Gates, Will P. orcid.org/0000-0001-7388-0289
Patti, A. F.
Turney, T. W.
Bouazza, A.
Rowe, R. K.
Journal name Geotextiles and geomembranes
Volume number 44
Issue number 5
Start page 748
End page 760
Total pages 13
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-10
ISSN 1879-3584
Keyword(s) GCLs
hypersalinity
glycerol carbonate
propylene carbonate
fluid loss
hydraulic conductivity
Summary The effect of adding glycerol carbonate (GC) or propylene carbonate (PC) to sodium (Na)-bentonite on the hydraulic performance of geosynthetic clay liners (GCLs) under hypersaline conditions is examined. Fluid loss (FL), swell index (SI) and solution retention capacity (SRC) measurements were carried out to compare the potential hydraulic performance of these two cyclic organic carbonates (COCs) as bentonite modifiers. A modified FL test enabled quantitative measurement of both the water retention characteristics of untreated and COC modified bentonites as well as calculation of hydraulic conductivity values. Tests under aggressively saline conditions (ionic strength, I ≥ 1 M of NaCl and ≥3 M of CaCl2) showed that at a mass ratio of 1:1 (GC to bentonite), the FL of a GC-Na-bentonite was ≈40–104 mL in NaCl and ≈61–91 mL in CaCl2. This was about 10–20 mL and 70–200 mL, respectively, lower than that of a comparable PC-Na-bentonite (1:1 PC to bentonite) and untreated Na-bentonite. Greater swelling (SI) and greater solution retention capacity (SRC) was observed for the GC treated Na-bentonite compared to untreated Na-bentonite in all salt solutions, and for PC-Na-bentonite at high ionic strength of both NaCl and CaCl2 solutions, demonstrating the superior hydraulic barrier performance of COC-bentonites under severely saline conditions. Experiments conducted in flexible-wall permeameters with I = 3 M CaCl2 showed approximately one order of magnitude lower (∼10−11 m/s vs ∼1.9 × 10−10 m/s) hydraulic conductivity of GC treated bentonite cake compared to the k value of the untreated Na-bentonite cake. Calculated hydraulic conductivity from fluid loss tests estimated the measured values in a conservative way (overestimation).
Language eng
DOI 10.1016/j.geotexmem.2016.06.002
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
Grant ID DP1095129
Copyright notice ©2016, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084638

Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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