In situ observations of the swelling of bentonite aggregates in NaCl solution

Satoru Suzuki; Somchai Prayongphan; Yasuaki Ichikawa; Byung Gon Chae

doi:10.1016/j.clay.2004.11.001

In situ observations of the swelling of bentonite aggregates in NaCl solution

Satoru Suzuki, Somchai Prayongphan, Yasuaki Ichikawa, Byung Gon Chae

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

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	https://doi.org/10.1016/j.clay.2004.11.001
Publication status	Published - Apr 1 2005
Externally published	Yes

Keywords

Bentonite aggregates
Laser scanning microscopy
Na-montmorillonite
Salinity
Swelling
Water permeability

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/j.clay.2004.11.001

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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.",

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AU - Suzuki, Satoru

AU - Prayongphan, Somchai

AU - Ichikawa, Yasuaki

AU - Chae, Byung Gon

PY - 2005/4/1

Y1 - 2005/4/1

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

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In situ observations of the swelling of bentonite aggregates in NaCl solution

Abstract

Keywords

ASJC Scopus subject areas

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