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Experiment JyU_E9R2

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Type: Semi-free swelling + X-ray CT
Tags: hydraulic mechanical chemical
Description: The sample is placed into a cylindrical volume, where it is wetted axially from one end. It can swell 4 mm, after that total volume remains constant. Results include bentonite and liquid content as a function of axial position, and axial swelling stress measured from both ends of the sample.
Contact
Name: Joni Tanttu
Institute
Name: University of Jyväskylä
Abbreviation: JyU
Website: www.jyu.fi
Article
Reference: Tanttu J., Harjupatana T., Miettinen A., Kataja M. Monitoring semi-free swelling and liquid transport in bentonites using X-ray radiography
Status: In press
Bentonite
Name: purified calcium montmorillonite
Supplier: Clay Technology AB
Mineralogical composition
Montmorillonite: $\pu{94.4 wt-\%}$
Quartz: $\pu{4.5 wt-\%}$
Cristobalite: $\pu{1.1 wt-\%}$
Cation exchange capacity: $\pu{0.88 eq/kg}$
Fluid
Name: CaCl water
Composition
Na+: $\pu{0 mmol/l}$
Ca2+: $\pu{325 mmol/l}$
Cl-: $\pu{650 mmol/l}$
Ionic strength: $\pu{975 mmol/l}$
Initial conditions
Bentonite dry density: $\pu{1.4 g/cm^3}$
Bentonite liquid content: $\pu{0.2 }$
Geometry
Type: Semi-free axial swelling in a cylinder
Diameter: $\pu{20 mm}$
Height: $\pu{10 mm}$
Boundaries
Top: stationary after 4 mm free swelling
Bottom: stationary
Lateral: stationary

Results

Attachments

E9R2.webm

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