The absorption of a 4 M NaCl solution in calcium-silicate brick was investigated by nuclear magnetic resonance scanning. This method has the advantage that quasi-simultaneously both the moisture and the Na profile can be measured during absorption. It was found that during the absorption process the Na ions clearly stay behind and hardly any Na is present near the wetting front. This is caused by binding of the Na ions to the pore surface. It is shown that both the moisture and the Na profiles during absorption can be scaled using the Boltzmann-Matano transformation.
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Pel et al. (2000) studied this question.
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