Abstract
Wetting, drying and permeation processes in various porous materials are of special interest to soil science and agriculture, building science and chemical engineering. Direct experimental study of unsaturated flow within such materials is hampered by the difficulty of detecting with precision changes in their internal water content distributions. In laboratory work on soils gravimetric sampling is widely used1. However, this is a destructive method which interferes with water flow processes and in any case is not easy to apply accurately to rigid materials such as permeable rocks, ceramics and building materials, γ-ray attenuation is the only established non-destructive instrumental method in laboratory use2,3. We report the first use of a nuclear magnetic resonance (NMR) imaging technique to monitor the dynamics of the internal water content distribution in several porous inorganic materials during capillary inflow.
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