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Effects of the Nature of the Exchangeable Cation and Clay Concentration on the Rheological Properties of Smectite Suspensions

Published online by Cambridge University Press:  01 January 2024

C. Malfoy ,
A. Pantet ,
P. Monnet  and
D. Righi
C. Malfoy*
Affiliation:
Université de Poitiers, HydrASA, UMR 6532, 40 avenue du recteur Pineau, 86022 Poitiers, France
A. Pantet*
Affiliation:
Université de Poitiers, HydrASA, UMR 6532, 40 avenue du recteur Pineau, 86022 Poitiers, France
P. Monnet*
Affiliation:
Université de Poitiers, LEA, UMR 6609, Boulevard Marie et Pierre Curie, 86962 Futuroscope cedex, France
D. Righi
Affiliation:
Université de Poitiers, HydrASA, UMR 6532, 40 avenue du recteur Pineau, 86022 Poitiers, France
*
*E-mail address of corresponding author: christine.malfoy@hydrasa.univ-poitiers.fr
†Groupe Géomécanique et Génie Civil de Poitiers
†Groupe Géomécanique et Génie Civil de Poitiers
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Abstract

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The rheological characteristics of purified bentonite suspensions as a function of exchangeable cation (Ca2+,NH4+,Li+)$({\rm{C}}{{\rm{a}}^{2 + }},{\rm{NH}}_4^ + ,\;{\rm{L}}{{\rm{i}}^ + })$ are studied at three different clay concentrations (40 gL−1, 60 gL−1, 80 gL−1). A Herschel-Bulkley model is used to determine rheological parameters such as yield value, consistency and fluidification index. The flow curves are typical for shear thinning fluids but differ on two points; presence of yield stress and/or thixotropy. The Li suspensions are not yield stress fluid, and the thixotropy is weakly expressed only for the 80 gL−1 suspension. On the contrary, Ca-clay suspension flow curves always present yield stress and a large thixotropic area. The NH4-clay suspensions exhibit an intermediate behavior as there is no thixotropy, but a yield stress appears for the most concentrated suspension. These differences in macroscopic mechanical properties are discussed with reference to the suggested microscopic clay organization in suspension.

Keywords

BentoniteClay SuspensionsExchangeable CationMechanical PropertiesMontmorilloniteRheology
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 6 , December 2003 , pp. 656 - 663
Copyright
Copyright © 2003, The Clay Minerals Society

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