Abstract
A comparison of the capacitance method and the microwave impulse method for the determination of moisture profiles in three typical porous building materials is presented in this paper. The basic principles of the measuring methods are given. The calibration process is described in detail. On the basis of the measured results, it can be concluded that the capacitance method provides better accuracy in the range of lower moisture content than to the microwave impulse method, which is more accurate for the highest values of moisture content.
Highlights
Measuring transient moisture profiles is considered as a common and effective tool for determination of the liquid moisture diffusivity of porous building materials
The measured moisture profiles are analyzed using the methods of inverse analysis, and the moisture diffusivity vs. moisture content function is determined
The TDR technique [10] originally used in soil science and X-ray radiography, evolved from the well-known medical technique [11,12] can be applied to building materials
Summary
Measuring transient moisture profiles is considered as a common and effective tool for determination of the liquid moisture diffusivity of porous building materials. In classical experimental setups rod specimens that are water and vapor proof insulated on all lateral sides (parallel to the direction of moisture transport) are placed in either horizontal or vertical position. They are brought into contact with thewater by one of their face sides. We use the capacitance method and the microwave impulse method to determine the moisture profiles in porous building materials
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