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 journalArticle

69 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 languageEnglish
Pages (from-to)89-98
Number of pages10
JournalApplied Clay Science
Volume29
Issue number2
DOIs
Publication statusPublished - Apr 2005
Externally publishedYes

Fingerprint

Bentonite
bentonite
swelling
Swelling
Hydraulic conductivity
hydraulic conductivity
Microstructural evolution
macropore
swell
Sodium Chloride
microscopy
Microscopic examination
laser
Scanning
Lasers
in situ
exposure

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 journalArticle

Suzuki, Satoru ; Prayongphan, Somchai ; Ichikawa, Yasuaki ; Chae, Byung Gon. / In situ observations of the swelling of bentonite aggregates in NaCl solution. In: Applied Clay Science. 2005 ; Vol. 29, No. 2. pp. 89-98.
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