Abstract
The microstructural evolution and hydraulic conductivity of bentonite in NaCl solution is investigated by in situ laser scanning microscopy (LSM). Upon exposure to saline solution, the bentonite aggregate swells rapidly, followed by a longer period of more gradual swelling. The expansion ratio of an aggregate reached a steady state 15 min after initial exposure to the solution. The steady-state expansion ratio decreased sharply with increasing NaCl concentration up to 0.1 mol/dm3 NaCl and then decreased gradually above 0.3 mol/dm3 NaCl. The results indicate that the fraction of macropores among bentonite aggregates increases with NaCl concentration, which is likely to account for increase in hydraulic conductivity under highly saline conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 89-98 |
| Number of pages | 10 |
| Journal | Applied Clay Science |
| Volume | 29 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Apr 2005 |
| Externally published | Yes |
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Keywords
- Bentonite aggregates
- Laser scanning microscopy
- Na-montmorillonite
- Salinity
- Swelling
- Water permeability
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geology
Cite this
In situ observations of the swelling of bentonite aggregates in NaCl solution. / Suzuki, Satoru; Prayongphan, Somchai; Ichikawa, Yasuaki; Chae, Byung Gon.
In: Applied Clay Science, Vol. 29, No. 2, 04.2005, p. 89-98.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - In situ observations of the swelling of bentonite aggregates in NaCl solution
AU - Suzuki, Satoru
AU - Prayongphan, Somchai
AU - Ichikawa, Yasuaki
AU - Chae, Byung Gon
PY - 2005/4
Y1 - 2005/4
N2 - The microstructural evolution and hydraulic conductivity of bentonite in NaCl solution is investigated by in situ laser scanning microscopy (LSM). Upon exposure to saline solution, the bentonite aggregate swells rapidly, followed by a longer period of more gradual swelling. The expansion ratio of an aggregate reached a steady state 15 min after initial exposure to the solution. The steady-state expansion ratio decreased sharply with increasing NaCl concentration up to 0.1 mol/dm3 NaCl and then decreased gradually above 0.3 mol/dm3 NaCl. The results indicate that the fraction of macropores among bentonite aggregates increases with NaCl concentration, which is likely to account for increase in hydraulic conductivity under highly saline conditions.
AB - The microstructural evolution and hydraulic conductivity of bentonite in NaCl solution is investigated by in situ laser scanning microscopy (LSM). Upon exposure to saline solution, the bentonite aggregate swells rapidly, followed by a longer period of more gradual swelling. The expansion ratio of an aggregate reached a steady state 15 min after initial exposure to the solution. The steady-state expansion ratio decreased sharply with increasing NaCl concentration up to 0.1 mol/dm3 NaCl and then decreased gradually above 0.3 mol/dm3 NaCl. The results indicate that the fraction of macropores among bentonite aggregates increases with NaCl concentration, which is likely to account for increase in hydraulic conductivity under highly saline conditions.
KW - Bentonite aggregates
KW - Laser scanning microscopy
KW - Na-montmorillonite
KW - Salinity
KW - Swelling
KW - Water permeability
UR - http://www.scopus.com/inward/record.url?scp=15344348433&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=15344348433&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2004.11.001
DO - 10.1016/j.clay.2004.11.001
M3 - Article
AN - SCOPUS:15344348433
VL - 29
SP - 89
EP - 98
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
IS - 2
ER -