Compressibility behaviour of bentonite and organically modified bentonite slurry

Sreedharan, V and Puvvadi, S (2013) Compressibility behaviour of bentonite and organically modified bentonite slurry. In: GEOTECHNIQUE, 63 (10). pp. 876-879.

PDF Geo_63-10_876_2013 - Published Version Restricted to Registered users only Download (215kB) | Request a copy

Abstract

Bentonite in slurry walls needs to be amended with organo-clay to control the migration of organic contaminants. Consolidation behaviour of the slurry is important because it will reduce the total effective stress owing to mobilisation of frictional force between the side wall of the trench and the slurry. Compressibility of the slurry of bentonite is expected to undergo significant changes owing to amendment with organo-clay and according to the nature of the fluid. Standard one-dimensional consolidation tests were carried out on slurries of bentonite, organo-clay and their mixtures by remoulding them to their respective liquid limit consistency with water as well as fluids of low polarity, such as carbon tetrachloride, and inundating with different fluids. Organo-clay and its mixture with bentonite when moulded with water exhibit lower compressibility than bentonite in any pore fluid, but their compressibility increases when moulded with carbon tetrachloride and inundated with the same fluid. These changes in the compressibility of bentonite amended with organo-clay are explained by particle rearrangements, changes in the development of the diffuse double layer and contribution from the water adsorbed in the inter-lamellar space of the clay.

Item Type:	Journal Article
Publication:	GEOTECHNIQUE
Publisher:	ICE PUBLISHING
Additional Information:	copyright for this article belongs to ICE PUBLISHING, ENGLAND
Keywords:	clays; compressibility; cut-off walls and barriers; laboratory tests; pollution migration/control
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	24 Jan 2014 07:12
Last Modified:	23 Oct 2018 07:22
URI:	http://eprints.iisc.ac.in/id/eprint/48229

Actions (login required)

View Item