Abstract
The flow behavior of bentonite colloidal suspensions is given in terms of the stress‐strain relations with respect to variables of concentration, suspension medium, hydrogen‐ion concentration, temperature, and the successive application of shear stress. Repeated cycling (successive reruns of upcurve and downcurve) caused thixotropic hysteresis loops which decreased in size to a final constant and reproducible flow curve. A hysteresis loop did not appear for a mixture of less than 20 wt% bentonite and glycerin. The flow curves are discussed in terms of bondings in “cardhouse” and “blockhouse” models for dilute and concentrated suspensions respectively. Eyring's rate theory of viscosity is discussed briefly in terms of the well‐known generalized viscosity equationwhich was applied successfully to given flow curves. Physical and chemical characterizations are compared in terms of thixotropic flow models for aqueous, glycerol, and oil (Bentone grease) suspensions.
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