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Expandability- layer stacking relationship during experimental alteration of a Wyoming bentonite in pH 13.5 solutions at 35 and 60°C

Published online by Cambridge University Press:  09 July 2018

F. Rassineux ,
L. Griffault ,
A. Meunier ,
G. Berger ,
S. Petit ,
P. Vieillard ,
R. Zellagui  and
M. Munoz
F. Rassineux*
Affiliation:
Etude Recherche Matériaux (ERM) - Bât. G.O.N , 40 avenue du Recteur Pineau, 86022 Poitiers Cedex
L. Griffault
Affiliation:
ANDRA—DS/HG, Parc de la Croix Blanche, 1—7 rue Jean Monnet, 92298 Châtenay-Malabry Cedex
A. Meunier
Affiliation:
HYDRASA—UMR-CNRS 6532, Université Poitiers, Bât. G.O.N., 40 avenue du Recteur Pineau, 86022 Poitiers Cedex
G. Berger
Affiliation:
LMTG—UMR 5563, Université Paul Sabatier, 38 rue des 36 Ponts, 31400 Toulouse, France
S. Petit
Affiliation:
HYDRASA—UMR-CNRS 6532, Université Poitiers, Bât. G.O.N., 40 avenue du Recteur Pineau, 86022 Poitiers Cedex
P. Vieillard
Affiliation:
HYDRASA—UMR-CNRS 6532, Université Poitiers, Bât. G.O.N., 40 avenue du Recteur Pineau, 86022 Poitiers Cedex
R. Zellagui
Affiliation:
HYDRASA—UMR-CNRS 6532, Université Poitiers, Bât. G.O.N., 40 avenue du Recteur Pineau, 86022 Poitiers Cedex
M. Munoz
Affiliation:
LMTG—UMR 5563, Université Paul Sabatier, 38 rue des 36 Ponts, 31400 Toulouse, France
*
*E-mail: françois.rassineux@erm.univ-poitiers.fr
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Abstract

The reaction of a Wyoming-type bentonite with pH 13.5 solutions was investigated experimentally at 35 and 60°C for periods of 1 to 730 days. Some crystal properties of the starting montmorillonitic clay remain unchanged, i.e. stability of the octahedral sheet, total cation exchange capacity (CEC) and CEC after neutralization of the octahedral charge, full expandability in the Casaturated state, and size distribution. Other properties are changed, e.g. there is an increase in the expandability after octahedral charge neutralization; a slight increase in the average layer charge; a decrease of the total surface area; and a particle morphological change from flakes to hexagonal shape.

The composition and the structure of the smectite layers did not change significantly during the reaction. The increasing number of expandable layers after octahedral charge neutralization is attributed to modifications in the stacking sequence. The number of interlayers surrounded by two charged tetrahedral sheets increases with reaction time.

Keywords

expandabilitytetrahedral chargeexperimentsmontmorillonitehigh pH
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 2 , June 2001 , pp. 197 - 210
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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