Capillary water migration in rock: process and material properties examined by NMR imaging

T. A. Carpenter, E. S. Davies, C. Hall, L. D. Hall, W. D. Hoff, M. A. Wilson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We report the application of proton nuclear magnetic resonance (NMR) imaging to the measurement of water content distributions in Lépine limestone, a typical constructional stone. The method is used to observe the kinetics of the absorption of water into this material by capillarity. The water content distributions are consistent with the predictions of unsaturated flow theory. The hydraulic diffusivity of Lépine stone is found to be an approximately exponential function of the water content, in agreement with experimental data on other porous materials. The best estimate of the diffusivity function is D (m2s-1) = 6.3 × 10-9 exp (4.90 θr), where θr is the normalized volumetric water content. The sorptivity estimated from NMR data is in close agreement with the directly measured value (1.00 mm min-1/2). NMR imaging methods appear promising as a non-destructive and rapid laboratory means of determining moisture distributions, especially for the purpose of accurate measurement of the capillary transport properties of porous materials. © 1993 RILEM.
    Original languageEnglish
    Pages (from-to)286-292
    Number of pages6
    JournalMaterials and Structures
    Volume26
    Issue number5
    DOIs
    Publication statusPublished - Jun 1993

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