Abstract

An activated-state model for the flow of aqueous bentonite suspensions has been used to match rheology data taken over a wide range of temperatures and shear rates. The parameters used in the theory all have physical significance and their values are consistant with estimates made independently. The activated state for clay flow appears to be the state where the clay plates are parallel and just passing each other. The main barrier to activation is the loss of rotational entropy associated with this alignment of the plates.

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