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Sandrine Paumier, Anne Pantet, Philippe Monnet, Nathalie Touze-Foltz
Evaluation of the viscoelastic properties of a clay material using a flow curve
Appl. Rheol. 19:2 (2009) 23824 (11 pages)
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The specific properties of bentonite such as hydration, swelling,water absorption, viscosity, yield stress and thixotropy make
it a valuable material in the form of mineral powder for a wide range of uses in agronomy, cosmetics and civil engineering.
A flow curve is a quick test used to evaluate the rheological basic properties of a viscous fluid. However, many bentonite dispersions
exhibit a complex flow curve, with yield stress and thixotropy area, especially at high concentration. In this study,
flow curves from raw and activated bentonites dispersed in water were acquired at 6, 8 and 10% mass concentrations. Five
stages along the flow curve were identified.To explain each stage, rheograms obtained from a dispersion made with a model
material were studied in depth. The model material was a smectite extracted from a raw bentonite then saturated with calcium
or sodium. Many homoionic and bi-ionic dispersions were prepared at various concentrations. The analysis and the
modelling of some creep-recovery tests by a Zener model showed the relationship between the initial stage in the flow curve,
named AB stage, and the viscoelastic properties of the fluid. The AB stage corresponds to the deformation of the material in
the solid state. The τB
point corresponds to an intermediate yield stress between the solid state and the start of the heterogeneous
fracturation. The study of many bi-ionic dispersions allowed drawing the evolution of the yield stress as a function of
concentration and saturation. The composition of the raw bentonites was expressed as an equivalent bi-ionic dispersion by
calculating an active smectite percentage. A good correlation was obtained at the highest concentrations between
τB from
the bi-ionic model dispersions and the raw bentonites dispersions
► Cite this publication as follows:
Paumier S, Pantet A, Monnet P, Touze-Foltz N: Evaluation of the viscoelastic properties of a clay material using a flow curve, Appl. Rheol. 19 (2009) 23824.
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