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Fabric Map for Kaolinite: Effects of pH and Ionic Concentration on Behavior

Published online by Cambridge University Press:  01 January 2024

Angelica M. Palomino  and
J. Carlos Santamarina
Angelica M. Palomino
Affiliation:
School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Drive, Atlanta, Georgia 30332-0355, USA
J. Carlos Santamarina*
Affiliation:
School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Drive, Atlanta, Georgia 30332-0355, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The behavior of fine-grained mineral systems is dependent on pore-fluid characteristics. The systematic analysis of previously published studies supports the development of a fabric map in the pH and ionic concentration space as a working hypothesis. This conceptual study is complemented with an extensive battery of tests where surface charge and particle interactions are controlled through pore-fluid characteristics. The macro-scale tests include sedimentation, viscosity and liquid limit, and involve a wide range of solid volume fractions (suspension to sediment) and strain levels. Experimental results permit the development of an updated fabric map on the pH-ionic concentration space which takes into consideration all experimental results. The fabric map is structured around a critical pH level and a threshold ionic concentration beyond which van der Waals attraction prevails.

Keywords

ClayDouble LayerElectrical ForcesLiquid LimitParticle-particle InteractionsSedimentationViscosity
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 3 , June 2005 , pp. 211 - 223
Copyright
Copyright © The Clay Minerals Society 2005

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