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Type: Wetting in a constant volume
Methods: µCT
Tags: hydraulic mechanical
Description: The sample is placed into a cylindrical volume, where it is wetted axially from one end using pressurised water. The total volume of the sample remains constant throughout the experiment. Results include bentonite water content as a function of axial position and time. Additionally, the water content has been converted to the degree of saturation by assuming a grain density of $\pu{2.78 g/cm^3}$. Approximately $\pu{2.0 mm}$ layers from both ends of the sample are rejected due to the uncertainties in the displacement measurements.
Contact
Name: Janne Yliharju
Institute
Name: University of Jyväskylä
Abbreviation: JyU
Website: www.jyu.fi
Bentonite
Name: Wyoming sodium bentonite
Supplier: Posiva Oy
Mineralogical composition
Montmorillonite: $\pu{88.2 wt-\%}$
Quartz: $\pu{3.5 wt-\%}$
Plagioclase: $\pu{2.9 wt-\%}$
K-feldspar: $\pu{2.4 wt-\%}$
Pyrite: $\pu{0.8 wt-\%}$
Rutile: $\pu{0.5 wt-\%}$
Cation exchange capacity: $\pu{0.81 eq/kg}$
Grain density: $\pu{2780 kg/m^3}$
Fluid
Name: Simulated groundwater
Composition
NaCl: $\pu{0.00195 M}$
CaCl2: $\pu{0.000567 M}$
Initial conditions
Bentonite dry density: $\pu{1.44 g/cm^3}$
Environment
Pressure: $\pu{2 MPa}$
Geometry
Type: Cylinder
Diameter: $\pu{42 mm}$
Height: $\pu{40.86 mm}$
Boundaries
Top: stationary
Bottom: stationary
Lateral: stationary

Results

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