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Title: Index properties of illite-bentonite mixtures in electrolyte solutions

Abstract

Bentonite, commonly used for liner constructions in waste containment systems, possesses many limitations. Illuite or illite containing bentonite has been proposed as an alternative material for liner construction. Their properties in different types of pore fluids are important to assess the long-term performance of the liner. Further, the illite-bentonite interaction occurs and changes their properties. The effect of these interactions are modified in electrolyte solutions has been brought out in this paper. The index properties have been studied since they give an indication of their engineering properties. Due to reduction in the thickness of the diffused double layer and consequent particle aggregation in bentonite, the effect of clay-clay interaction reduces in electrolyte solutions. In electrolyte solutions, the liquid limit, the plasticity index, and free swell index of bentonite are lower than illite. The plasticity index of bentonite is further reduced in KCl solution. Clays with a higher plasticity index perform better to retain pollutants and reduce permeability. Hence, the presence of both illite and bentonite ensures better performance of the liner in different fluids.

Authors:
;  [1]
  1. Indian Inst. of Science, Bangalore (India). Dept. of Civil Engineering
Publication Date:
OSTI Identifier:
691508
Resource Type:
Journal Article
Journal Name:
Geotechnical Testing Journal
Additional Journal Information:
Journal Volume: 22; Journal Issue: 3; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; ILLITE; BENTONITE; PERMEABILITY; ELECTROLYTES; LINERS; SANITARY LANDFILLS; CONTAINMENT SYSTEMS; PLASTICITY; SWELLING; HYDRAULIC CONDUCTIVITY

Citation Formats

Sivapullaiah, P.V., and Savitha, S. Index properties of illite-bentonite mixtures in electrolyte solutions. United States: N. p., 1999. Web.
Sivapullaiah, P.V., & Savitha, S. Index properties of illite-bentonite mixtures in electrolyte solutions. United States.
Sivapullaiah, P.V., and Savitha, S. Wed . "Index properties of illite-bentonite mixtures in electrolyte solutions". United States.
@article{osti_691508,
title = {Index properties of illite-bentonite mixtures in electrolyte solutions},
author = {Sivapullaiah, P.V. and Savitha, S.},
abstractNote = {Bentonite, commonly used for liner constructions in waste containment systems, possesses many limitations. Illuite or illite containing bentonite has been proposed as an alternative material for liner construction. Their properties in different types of pore fluids are important to assess the long-term performance of the liner. Further, the illite-bentonite interaction occurs and changes their properties. The effect of these interactions are modified in electrolyte solutions has been brought out in this paper. The index properties have been studied since they give an indication of their engineering properties. Due to reduction in the thickness of the diffused double layer and consequent particle aggregation in bentonite, the effect of clay-clay interaction reduces in electrolyte solutions. In electrolyte solutions, the liquid limit, the plasticity index, and free swell index of bentonite are lower than illite. The plasticity index of bentonite is further reduced in KCl solution. Clays with a higher plasticity index perform better to retain pollutants and reduce permeability. Hence, the presence of both illite and bentonite ensures better performance of the liner in different fluids.},
doi = {},
journal = {Geotechnical Testing Journal},
number = 3,
volume = 22,
place = {United States},
year = {1999},
month = {9}
}