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Barrier Performance of Bentonite-Polyacrylate Nanocomposite to Artificial Ocean Water
The hydraulic conductivity and typical indicator parameters (swell index, fluid loss) of a bentonite-polyacrylate nanocomposite (BPN) to artificial ocean water is evaluated. Thin layers of BPN and Na-bentonite simulating geosynthetic clay liners (GCLs) were permeated directly in flexible-wall permeameters under low average effective stress (20 kPa). BPN retained low-hydraulic conductivity (less than 1.8 x 10-12 m/s) to artificial ocean water at hydraulic and chemical equilibrium termination criteria. In contrast, Na-bentonite permeated with artificial ocean water had a hydraulic conductivity at least 4.5 orders of magnitude higher. BPN maintains low-hydraulic conductivity in artificial ocean water despite having a low swell index (9.0 mL/2 g), similar to Na-bentonite in the same solution (9.3 mL/2 g). Despite low swelling, BPN exhibited a low fluid loss (8.1 mL) similar to BPN in deionized water (6.5 mL) and eight times lower than Na-bentonite in artificial ocean water (66 mL). These data illustrate that BPN can be used to prevent saltwater intrusion, or for the containment of sodic solutions, but that swell index is not an accurate indicator for the hydraulic conductivity of BPN. Fluid loss appears to be a more useful indicator parameter for BPN.
Barrier Performance of Bentonite-Polyacrylate Nanocomposite to Artificial Ocean Water
The hydraulic conductivity and typical indicator parameters (swell index, fluid loss) of a bentonite-polyacrylate nanocomposite (BPN) to artificial ocean water is evaluated. Thin layers of BPN and Na-bentonite simulating geosynthetic clay liners (GCLs) were permeated directly in flexible-wall permeameters under low average effective stress (20 kPa). BPN retained low-hydraulic conductivity (less than 1.8 x 10-12 m/s) to artificial ocean water at hydraulic and chemical equilibrium termination criteria. In contrast, Na-bentonite permeated with artificial ocean water had a hydraulic conductivity at least 4.5 orders of magnitude higher. BPN maintains low-hydraulic conductivity in artificial ocean water despite having a low swell index (9.0 mL/2 g), similar to Na-bentonite in the same solution (9.3 mL/2 g). Despite low swelling, BPN exhibited a low fluid loss (8.1 mL) similar to BPN in deionized water (6.5 mL) and eight times lower than Na-bentonite in artificial ocean water (66 mL). These data illustrate that BPN can be used to prevent saltwater intrusion, or for the containment of sodic solutions, but that swell index is not an accurate indicator for the hydraulic conductivity of BPN. Fluid loss appears to be a more useful indicator parameter for BPN.
Barrier Performance of Bentonite-Polyacrylate Nanocomposite to Artificial Ocean Water
Scalia, IV, J. (author) / Benson, C. H. (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1826-1835
2014-02-24
Conference paper
Electronic Resource
English
Barrier Performance of Bentonite-Polyacrylate Nanocomposite to Artificial Ocean Water
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