Fabric Map For Kaolinite (Single Mineral): Effects of pH And Ionic Concentration On Behavior, Clays and Clay Minerals
byAngelica M. Palomino, J. Carlos Santamarina
Palomino, A. M. and Santamarina, J. C. (2005). "Fabric Map For Kaolinite (Single Mineral): Effects of pH And Ionic Concentration On Behavior, Clays and Clay Minerals." Vol. 53, No. 3, pp. 211-223
The behavior of fine-grained mineral systems is dependent on pore-fluid characteristics. The systematic physical 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 macroscale 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.