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http://dx.doi.org/10.7733/jkrws.2011.9.4.199

Influence of Water Salinity on the Hydraulic Conductivity of Compacted Bentonite  

Cho, Won-Jin (Korea Atomic Energy Resrarch Institute)
Kim, Jin-Seop (Korea Atomic Energy Resrarch Institute)
Choi, Jong-Won (Korea Atomic Energy Resrarch Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.9, no.4, 2011 , pp. 199-206 More about this Journal
Abstract
The influence of water salinity on the hydraulic conductivities of compacted bentonites with several dry densities were studied. The hydraulic conductivity increases with increasing salinity only when the dry density of bentonite is relatively low. The degree of increase becomes more remarkable at a lower dry density of bentonite. For bentonite with the density of 1.0 $Mg/m^3$ and 1.2 $Mg/m^3$, the hydraulic conductivity of the 0.4 M NaCl solution increases up to about 7 times and 3 times, respectively higher than that of freshwater. However, for the bentonite with a dry density higher than 1.4 $Mg/m^3$, the salinity has an insignificant effect on the hydraulic conductivity, and the hydraulic conductivity is nearly constant within the salinity range of 0.04 to 0.4 M NaCl. The pre-saturation of the bentonite specimen with freshwater has no significant influence on the hydraulic conductivity.
Keywords
hydraulic conductivity; bentonite; salinity effects; diffuse double layer; electric potential;
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