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Swelling pressure of sodium montmorillonites

Sridharan, A and Choudhury, D (2002) Swelling pressure of sodium montmorillonites. In: Geotechnique, 52 (6). pp. 459-462.

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Determination of the swelling pressure of montmorillonitic clays is required in many situations concerned with stability problems of foundations, retaining walls, slope stability of embankments and excavations in expansive soils. Recently expansive soils such as bentonite have been used as a mixture backfill material, for example as backfill material for nuclear waste disposal systems, for which a knowledge of the swelling pressure is desirable. This is the pressure required to keep the clay-water system at the required void ratio when it is allowed to absorb water or electrolyte. If the pressure is less than the swelling pressure, volume expansion occurs; if the pressure is more than the swelling pressure, volume compression occurs. Because of isomorphous substitutions in the crystal lattice, in general the clay particles carry negative charges at the surfaces of the platelets. Exchangeable cations in the clay media are attracted to these negative charges, but this attraction is opposed by the tendency of ions to be distributed. As a result, an electric diffuse double layer is formed (Gouy, 1910).

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Thomas Telford.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Ms V Mangala
Date Deposited: 28 Jul 2011 04:55
Last Modified: 28 Jul 2011 04:55
URI: http://eprints.iisc.ac.in/id/eprint/39438

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