Shear Kaolin clay

Henry et al (23) have collected experimental data on cross-flow electro-filtration of Kaolin clay suspensions and oil-water emulsions. Since both the Kaolin particles and the oil droplets are negatively charged in aqueous suspensions, a direct electric field will always give higher filtration rates than cross-flow filtration alone. The level of improvement depends on the intensity of the fluid shear and the electric-field strength. Figures 47 and 48 present data for the Increase in flux with electric field strength for the oil-water emulsion and the clay suspension. 

This paper is a contribution to the subject of thermal effects on the mechanical behaviour of clays. We concentrate here on the presentation of experimental results obtained on a Kaolin clay under triaxial conditions at two temperatures (22 °C and 90 °C), in view of determining the evolution of the shear yield surface with temperature. A new temperatureapparatus developed by the authors was used (Cekerevac et al. 2(X)3). Temperature effects were identified by comparing the results of tests... 

The strength envelope at critical state of Kaolin clay at ambient temperature shows a straight line, with a slope M = 0.8 that corresponds to a friction angle of ( ) =21°. Figure 3 combines the results of drained shear tests at critical state obtained at ambient and high temperatures (90°C). It is clearly shown that the strength envelope at critical state is independent of testing temperature. 

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