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Clays and Clay Minerals; June 2005; v. 53; no. 3; p. 211-223; DOI: 10.1346/CCMN.2005.0530302
© 2005 Clay Minerals Society
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FABRIC MAP FOR KAOLINITE: EFFECTS OF pH AND IONIC CONCENTRATION ON BEHAVIOR

Angelica M. Palomino and J. Carlos Santamarina*

School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Drive, Atlanta, Georgia 30332-0355, USA

* E-mail address of corresponding author: carlos.santamarina{at}ce.gatech.edu

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.

Key Words: Clay • Double Layer • Electrical Forces • Liquid Limit • Particle-particle Interactions • Sedimentation • Viscosity




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CLAY MINERAL FORMATION DURING PODZOLIZATION IN AN ALPINE ENVIRONMENT OF THE TATRA MOUNTAINS, POLAND
Clays and Clay Minerals, December 1, 2007; 55(6): 618 - 634.
[Abstract] [Full Text] [PDF]


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