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Prediction for swelling deformation of fractal-textured bentonite and its sand mixtures in salt solution.
- Source :
-
Clay Minerals . Jun2019, Vol. 54 Issue 2, p161-167. 7p. - Publication Year :
- 2019
-
Abstract
- Swelling deformation tests of Kunigel bentonite and its sand mixtures were performed in distilled water and NaCl solution. The salinity of NaCl solution has a significant impact on the swelling properties of bentonite, but not on its surface structure. The surface structure was characterized using the fractal dimension Ds. Based on the fractal dimension, a unique curve of the em-pe relationship (em is the void ratio of montmorillonite and pe is the effective stress) at full saturation was introduced to express the swelling deformation of bentonite- sand mixtures. In mixtures with a large bentonite content, the swelling deformation always followed the em-pe relationship. In mixtures with a small bentonite content, when the effective stress reached a threshold, the void ratio of montmorillonite em deviated from the unique em-pe curve due to the appearance of a sand skeleton. The threshold of vertical pressure for mixtures in different solutions and the maximum swelling strains were estimated using the em-pe relationship. The good agreement between estimates and experimental data suggest that the em-pe relationship might be an alternative method for predicting the swelling deformation of bentonite-sand mixtures in salt solution. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SOLUTION (Chemistry)
*BENTONITE
*FRACTAL dimensions
*MIXTURES
*SAND
Subjects
Details
- Language :
- English
- ISSN :
- 00098558
- Volume :
- 54
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Clay Minerals
- Publication Type :
- Academic Journal
- Accession number :
- 137619351
- Full Text :
- https://doi.org/10.1180/clm.2019.24