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Experiment JyU_E3R1

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

Email: joni.tanttu@jyu.fi

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: Wyoming bentonite

Trade name: Bara-Kade

Supplier: Bentonite Performance Minerals LLC

Grain density: $\pu{2780 kg/m^3}$

Mineralogical composition

Montmorillonite: $\pu{83.9 wt-\%}$

Quartz: $\pu{83.9 wt-\%}$

Plagioclase: $\pu{3.2 wt-\%}$

K-feldspar: $\pu{1.9 wt-\%}$

Gypsum: $\pu{1.3 wt-\%}$

Pyrite: $\pu{1.2 wt-\%}$

Calcite: $\pu{1.1 wt-\%}$

Cristobalite: $\pu{0.7 wt-\%}$

Illite/mica: $\pu{0.4 wt-\%}$

Anatase: $\pu{0.2 wt-\%}$

Cation exchange capacity: $\pu{0.86 eq/kg}$

Fluid

Name: Salt water

Composition

Na+: $\pu{540 mmol/l}$

Ca2+: $\pu{145 mmol/l}$

Cl-: $\pu{830 mmol/l}$

Ionic strength: $\pu{975 mmol/l}$

Initial conditions

Bentonite dry density: $\pu{1.4 g/cm^3}$

Bentonite liquid content: $\pu{0.14 }$

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

E3R1.webm

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