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The Time Domain Reflectometry (TDR) method can be generally classified as a dielectric method for moisture measurement, which is based on an analysis of the behavior of dielectrics in a time-varying electric field and consists in the measurement of permittivity of moist porous media. It is commonly used for moisture measurements in loose materials. In this study, an application of the TDR method for measuring moisture content in porous building materials is presented. In the calibration process, several different homogenization techniques, among them formulas proposed by Dobson et al., de Loor, Boettcher, Polder and van Santen and Lichtenecker, as well as some empirical formulas developed for various types of soils are applied. The results are compared with the empirical calibration function determined by the gravimetric method. On the basis of this analysis, suitable mixing formulas are identified and recommendations for their practical application are formulated.
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