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Type: Wetting in a constant volume
Tags: hydraulic mechanical chemical
Methods: µCT, µXRF
Description: The sample is placed into a cylindrical volume, where it is wetted axially from one end using water that has specific salts in it. Several X-ray tomographic images of the sample are taken during the wetting process. The gray-value profile in the wetting direction is recorded. The salty water is visible as increased gray level. The wetting process is first done wit NaCl + CaCl2 water solution until saturation is reached, and then continued with marker salt specified below. After wetting, the salt content profile is measured with micro-XRF from the surface of the sample.
Contact
Name: Jukka Kuva
Institute
Name: Geological Survey of Finland
Abbreviation: GTK
Website: www.gtk.fi
Article
Status: In preparation
Bentonite
Name: Wyoming sodium bentonite
Supplier: Posiva Oy
Mineralogical composition
Montmorillonite: 88.2 wt%
Quartz: 3.5 wt%
Plagioclase: 2.9 wt%
K-feldspar: 2.4 wt%
Pyrite: 0.8 wt%
Rutile: 0.5 wt%
Cation exchange capacity: 0.81 eq/kg
Grain density: 2780 kg/m3
Saturating fluid
Name: Salt water
Composition
NaCl: 0.103 M
CaCl2: 0.027 M
Fluid
Name: Salt water
Composition
CsCl: 0.271 M
Initial conditions
Bentonite dry density: 1.864 g/cm3
Geometry
Type: Cylinder
Diameter: 42 mm
Height: 20.69 mm
Boundaries
Top: stationary
Bottom: stationary
Lateral: stationary

Results

0510152024k24.5k25k25.5k26k26.5k27k27.5k28k
dry1 d7 d14 d18 d28 d32 dGray levels (first phase, initial saturation)
0510152027k28k29k30k31k32k33k34k35k
dry2 d7 d14 d21 dGray levels (second phase)

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