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A simple and popular constitutive model used to describe the compressionalstrength of a consolidating strongly cohesive particulate gel is tested furtherwith new experimental data. Strong cohesive particulate gels have variouslybeen described as being ratchet (poro) elastic, on the one hand, and as havinga yield stress in compression, on the other, to the point where same groups ofworkers have used both descriptions at one time or another. The dichotomy isreal though as such gels do show a hitherto somewhat puzzling elastic-plasticduality. This can be explained in part by the strong concentration dependenceof the modulus since this leads to irreversible volumetric strain-hardening, ineffect, the ratchet; but only in small part. The real problem seems to be that,until very recently, most work on consolidation has neglected what whatMichaels and Bolger told us to do over 50 years ago, viz. to take into walladhesion into account, most cohesive particulate gels being adhesive too. Sincewall adhesive failure is plastic in character, the simplest non-linear elasticmodel of compressive strength can be combined with the simplest possible modelof wall debonding to produce a approximate complete constitutive description.Examples of the use of such a description in detailed modelling ofconsolidation equilibrium can be found in refs 10-12. Consolidation dynamicswith wall adhesion is a substantial modelling challenge remaining to betackled.

Yielding and flow in aggregated particulate suspensions