Abstract
In the introduction of the paper there is characterized a way of monitoring the moisture in the structure of the railway substructure and its subgrade in the Experimental stand DRETM II, which is a part of the experimental workplace of the Department of Railway Engineering and Track Management. The substantial part of the paper is devoted to the characteristics and calibration of TDR (Time domain reflectometry) test probes for selected rock materials, which are incorporated into the construction of Experimental stand DRETM II (crushed aggregate fr.0/31.5mm, crushed aggregate fr.0/63mm and clay blended with river gravel), as a basic prerequisite for determination of the actual moisture and its changes in the body of the railway substructure and subgrade during the year. Finally, this article outlines a comparison of individual TDR probes used in calibration and their suitability for monitoring moisture in various materials used in construction layers of the Experimental stand DRETM II.
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