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The relative humidity dependence of the permeability of cement paste measured using GARField NMR profiling

Zamani, S, Kowalczyk, RM and McDonald, PJ (2014) The relative humidity dependence of the permeability of cement paste measured using GARField NMR profiling Cement and Concrete Research, 57. pp. 88-94.

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Abstract

The relative humidity (RH) dependence of the water permeability of cement is calculated from the water concentration profile of a paste exposed to an RH gradient and the desorption isotherm. The profile is measured using GARField, standing for Gradient at Right Angles to Field, NMR. The isotherm is derived from other earlier NMR measurements. The Darcy equation gives the intrinsic permeability as 4.6 × 10 m. The apparent intrinsic permeability to water flow shows a broad "U" shape dependence on RH, with a minimum of 7 × 10 m at RH 55%. The "U" shape is attributed to the fact that the transport mechanism involves a coupling of liquid and vapour modes. The data is further analysed in terms of a model of coupled liquid and vapour diffusion and Darcy flow due to Baroghel-Bouny et al. (Cem. Concr. Res. 2011 41 828) from which the relative liquid water and vapour permeabilities are calculated. They are strongly RH dependent. The former increases with increasing RH; the latter decreases. © 2013 Elsevier Ltd.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Zamani, SUNSPECIFIEDUNSPECIFIED
Kowalczyk, RMUNSPECIFIEDUNSPECIFIED
McDonald, PJUNSPECIFIEDUNSPECIFIED
Date : March 2014
Identification Number : 10.1016/j.cemconres.2013.12.010
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Cement and Concrete Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cement and Concrete Research 57, March 2014, DOI 10.1016/j.cemconres.2013.12.010.
Depositing User : Symplectic Elements
Date Deposited : 01 May 2014 08:51
Last Modified : 09 Jun 2014 13:56
URI: http://epubs.surrey.ac.uk/id/eprint/805235

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