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The behaviour in simple shear of two concentrated and strongly cohesivemineral suspensions showing highly non-monotonic flow curves is described. Tworheometric test modes were employed, controlled stress and controlledshear-rate. In controlled stress mode the materials showed runaway flow above ayield stress, which, for one of the suspensions, varied substantially in valueand seemingly at random from one run to the next, such that the up flow-curveappeared to be quite irreproducible. The down-curve was not though, as neitherwas the curve obtained in controlled rate mode, which turned out to betriple-valued in the region where runaway flow was seen in controlled risingstress. For this first suspension, the total stress could be decomposed intothree parts to a good approximation: a viscous component proportional to aplastic viscosity, a constant isostatic contribution, and a third shear-ratedependent contribution associated with the particulate network which decreasedwith increasing shear-rate raised to the -7/10th power. In the case of thesecond suspension, the stress could be decomposed along similar lines, althoughthe strain-rate softening of the solid-phase stress was found to be logarithmicand the irreducible isostatic stress was small. The flow curves are discussedin the light of recent simulations and they conform to a very simple butgeneral rule for non-monotonic behaviour in cohesive suspensions and emulsions,namely that it is caused by strain-rate softening of the solid phase stress.

The non-monotonic shear-thinning flow of two strongly cohesive concentrated suspensions