Over the last 10 years, there has been a growing interest in NMR research on fluids confined in porous materials. The so-called longitudinal (T1) and transverse (T2) relaxation times of hydrogen nuclei in a fluid depend in principle on the pore size. Because we are interested in the moisture transport through building materials, we look at the hydrogen nuclei of the water molecules in the pores of the building material. The interpretation of these NMR relaxation times in terms of a pore-size distribution is called relaxometry and will be briefly described below.
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