Unsaturated diffusivity functions for concrete derived from NMR images

Leech, C, Lockington, D and Dux, P (2003) Unsaturated diffusivity functions for concrete derived from NMR images. Materials And Structures, 36 260: 413-418. doi:10.1617/13760


Author Leech, C
Lockington, D
Dux, P
Title Unsaturated diffusivity functions for concrete derived from NMR images
Journal name Materials And Structures   Check publisher's open access policy
ISSN 1359-5997
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1617/13760
Volume 36
Issue 260
Start page 413
End page 418
Total pages 6
Editor M Brusin
Place of publication France
Publisher RILEM Publications S.A.R.L.
Language eng
Subject C1
290801 Structural Engineering
680302 Cement and concrete materials
Abstract Deterioration of concrete or reinforcing steel through excessive contaminant concentration is often the result of repeated wetting and drying cycles. At each cycle, the absorption of water carries new contaminants into the unsaturated concrete. Nuclear Magnetic Resonance (NMR) is used with large concrete samples to observe the shape of the wetting profile during a simple one-dimensional wetting process. The absorption of water by dry concrete is modelled by a nonlinear diffusion equation with the unsaturated hydraulic diffusivity being a strongly nonlinear function of the moisture content. Exponential and power functions are used for the hydraulic diffusivity and corresponding solutions of the diffusion equation adequately predict the shape of the experimental wetting profile. The shape parameters, describing the wetting profile, vary little between different blends and are relatively insensitive to subsequent re-wetting experiments allowing universal parameters to be suggested for these concretes.
Keyword Construction & Building Technology
Engineering, Civil
Materials Science, Multidisciplinary
Sorptivity
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 11:36:14 EST