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Dominique Dupuis, Karim Bekkour, Kaouther Ben Azouz
On the modeling of the rheological behaviour of bentonite dispersions in polymer solutions

Appl. Rheol. 24:2 (2014) 24283 (9 pages)

Bentonite dispersions in polymer solutions may behave as gel like materials. Under stress, the structure formed at rest is progressively destroyed and a solid-liquid transition occurs. The rheological characterization of such kind of systems is often done by applying stress ramps of the sample. A simple Herschel-Bulkley equation is not convenient to fit the answer of the material to the ramp since it does not take in account the effect of time. The models for yield stress fluids involving two viscosity levels are not convenient too since they don.t take in account the elastic behavior at low stresses. We propose in this paper two equations in order to determine some parameters characterizing the rheological behavior of such systems. The results obtained both in oscillatory and permanent shear are compared according to Winter.s representation and a rescaling of the complex modulus is proposed to superimposed the data in the solid/liquid transition region.

Cite this publication as follows:
Dupuis D, Bekkour K, BenAzouz K: On the modeling of the rheological behaviour of bentonite dispersions in polymer solutions, Appl. Rheol. 24 (2014) 24283.

Kaouther Ben Azouz, Dominique Dupuis, Karim Bekkour
Rheological characterizations of dispersions of clay particles

Appl. Rheol. 20:1 (2010) 13041 (9 pages)

In this work,we consider model fluids which are dispersions of clay particles in aqueous solutions of carboxymethyl cellulose. Their rheological properties are measured in both steady and oscillatory shear flows.We present the experimental results obtained for different polymer concentrations and for three different molecular weights of the polymer. The clay is a bentonite sample and the particle concentration is fixed to a value of 5 %. The mechanical properties of these materials is the result of a competition between different mechanisms: association-dissociation of aggregates of particles, adsorption of polymer on the particles and desorption of solvent molecules from the particles, bridging of the particles by long polymer chains.

Cite this publication as follows:
BenAzouz K, Dupuis D, Bekkour K: Rheological characterizations of dispersions of clay particles , Appl. Rheol. 20 (2010) 13041.

D. Dupuis
39th Meeting of the French Rheology Group (GFR)

Appl. Rheol. 15:1 (2005) 49-50

Cite this publication as follows:
Dupuis D: 39th Meeting of the French Rheology Group (GFR), Appl. Rheol. 15 (2005) 49.

Delegates of the national rheological societies
Society's Site Mar 2004 - Aug 2004

Appl. Rheol. 14:1 (2004) 55-63

Cite this publication as follows:
Rheological Societies, Emri I, Mielke W, Fischer P, Boudouvis A, Dupuis D: Society's Site Mar 2004 - Aug 2004 , Appl. Rheol. 14 (2004) 55.


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