Uso de argilas esmectíticas em lamas para execução de paredes diafragma.

Abstract

As the studies about smectitic clays dispersions for diaphragm walls are reduced, a wider analysis of its characteristics became necessary. This work relates the reologic characteristics that smectitic clays dispersions should have to be used in diaphragm wall constructions. Six samples of sodic smectitic clay manufactured in the state of Paraiba and two samples of policationic smectitic clays, were transformed into sodic smectities in laboratory and studied the additives Espercene, XP-20 and carboximethicellulose on those samples. Finally, this work correlates the data obtained by the Marsh viscometer with the ones obtained by the rotational viscometer Fann 35-A. The characteristics of the slurry studied were; Marsh viscosity, apparent viscosity, plastic viscosity, yeld point, filtrate, cake, pH and humidity. In this context, the results indicated that smectitic clays from Boa Vista - PB had the characteristics for diaphragm wall construction.