Vapour transfer in unsaturated compacted bentonite

Cleall, Peter John ORCID: https://orcid.org/0000-0002-4005-5319, Singh, Rao Martand and Thomas, Hywel Rhys ORCID: https://orcid.org/0000-0002-3951-0409 2013. Vapour transfer in unsaturated compacted bentonite. Géotechnique 63 (11) , pp. 957-964. 10.1680/geot.12.P.147

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Abstract

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
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Uncontrolled Keywords:	partial saturation; laboratory tests; temperature effects
Publisher:	ICE Publishing
ISSN:	0016-8505
Last Modified:	24 Oct 2022 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/48369

Available Versions of this Item

• Vapour transfer in unsaturated compacted bentonite. (deposited 27 Jun 2013 08:09) [Currently Displayed]
  • Vapour transfer in unsaturated compacted bentonite. (deposited 26 Sep 2013 15:08)

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