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Experiment JyU_E8R1

Type: Semi-free swelling

Methods: µCT

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: purified sodium montmorillonite

Supplier: Clay Technology AB

Mineralogical composition

Montmorillonite:

95.4 wt - %

Quartz:

4 wt - %

Cristobalite:

0.6 wt - %

Cation exchange capacity:

0.97 eq / kg

Fluid

Name: NaCl water

Composition

Na+:

3.5 mmol / l

Ca2+:

0 mmol / l

Cl-:

3.5 mmol / l

Ionic strength:

3.5 mmol / l

Initial conditions

Bentonite dry density:

1.8 g / {cm}^{3}

Bentonite liquid content:

0.19

Geometry

Type: Cylinder

Diameter:

20 mm

Height:

10 mm

Boundaries

Top: stationary after 4 mm free swelling

Bottom: stationary

Lateral: stationary

Results

Attachments

E8R1.webm

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