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Vapour transfer in unsaturated compacted bentonite

Cleall, PJ, Singh, RM and Thomas, HR (2013) Vapour transfer in unsaturated compacted bentonite Geotechnique: international journal of soil mechanics, 63 (11). pp. 957-964.

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Results of an experimental and theoretical investigation of heat and moisture movement in unsaturated MX-80 bentonite are presented. A thermo-hydraulic cell that allows measurement of transient temperatures and facilitates the determination of pseudo-transients of moisture content, dry density and chemical composition has been used to perform thermal gradient tests. Results of a number of tests are presented, and observation of the accumulation of chloride ions near the hot end clearly indicates that there is a cycle of vapour and liquid moisture movement, with vapour moving from hotter to cooler regions, condensing, and then moving as liquid towards the hotter regions. An empirical method is applied to calculate approximate vapour fluxes using measured variations in chloride ion concentration and moisture content with time. The vapour fluxes calculated empirically are found to be lower than those determined by some existing vapour flow theories. Subsequently, an existing vapour flow model is modified to represent the observed vapour fluxes more closely.

Item Type: Article
Subjects : Civil Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Cleall, PJ
Thomas, HR
Date : September 2013
DOI : 10.1680/geot.12.P.147
Copyright Disclaimer : © 2013 ICE Publishing. This is an open access article under the CC BY-NC-ND license
Uncontrolled Keywords : Laboratory tests, Partial saturation, Temperature effects
Depositing User : Symplectic Elements
Date Deposited : 01 Aug 2016 10:42
Last Modified : 04 Sep 2019 11:29

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