.. Typologie-des-rhéogrammes-obtenus, 139 4.2.1 Identification des phases 139 4.2.2 Impact de la concentration et de la saturation sur les rhéogrammes, p.142

S. Thixotropie-des and .. De-la-contrainte, 155 4.5.1 Effet du temps d'établissement

C. Les, Toutefois, 8 des 12 bentonites ont des CEC comprises entre 66 et 76 meq/100g. Seules Ca-sm et Na-sm ont des CEC nettement supérieures (de l'ordre de 100 meq/100g, Ca 1 et Ca + 2 ont des CEC très faibles

C. Les and . Bentonites, tout comme leurs surfaces spécifiques, sont fonction de la quantité de smectite dans la bentonite. En effet, pour une même masse, une bentonite contenant de nombreux minéraux non argileux (à surface spécifique très faible) aura une surface active globale plus

. Ainsi, les échantillons de Ca-sm et Na-sm, enrichis en smectite, ont une forte CEC. A l'inverse Ca 1 et Ca + 2 ont une très faible CEC

. Ainsi, Ca-sm, associé en tactoïdes, a une forte CEC mais une faible surface spécifique (469 m 2 /g) tandis que la surface spécifique de Na-sm est très importante

D. La-partie and . De-la-courbe, Herschel Bulkley (Fig. 5.10) Na-sm forme les suspensions les plus visqueuses, les plus rhéofluidifiantes et avec les seuils les plus marqués. Seules les suspensions de Na 1 présentent également des seuils d'écoulement importants. Les aires de thixotropie, calculées par la méthode des trapèzes

. Fig, 23 ? Distribution granulométrique obtenue par granulométrie laser pour des bentonites calciques et sodiques naturelles après deux heures (2 h), une journée (1 j)

. Fig, 26 ? Rhéogrammes en contrainte imposée (essai 2) obtenus pour des suspensions de bentonites sodiques naturelles à diverses concentrations (60, 80 et 100 g/l)

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