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Determination of the vaporization plane depth in sandstones and other porous materials: uranine-coated needles
Mareš, Jakub ; Weiss, Tomáš (advisor) ; Válek, Jan (referee)
Abstact The vaporization plane in porous materials separates the capillary zone, the area where water moves in liquid state, from the dry surface layer where water moves in the form of vapor. The depth of the vaporization plane and its geometry is essential for a large number of physical, chemical and biological processes in porous materials that can, for example, cause material degradation and decay. Mostly, the vaporization plane is not measured directly, but water content or suction pressure measurements are used instead, which are, however, not suitable for the plane's detection. Therefore, there was a need for a method that would be able to determine the depth of the vaporization plane in holes of small diameter (<1 cm). To fulfill this aim, I used a needle onto which I applied glue and uranine. Upon insertion, uranine on the needle dissolves in the capillary zone and changes its color from red to green, while remaining red in the dry zone. The boundary between the red and green parts thus accurately displays the vaporization plane. With this newly developed method, I subsequently measured the depth of the vaporization plane on natural outcrops as well as on buildings, where I tried to describe the vaporization plane's behavior.
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Methodology of the use of non-invasive surveying methods - ground-penetrating radar, impact-echo method and ultrasonic transmission measurement of the surface to assess the condition and construction details of the sandstone coat of buildings
Havlín, J. ; Slavíková, M. ; Válek, Jan ; Pavelka, K.
The methodology describes principles of selected methods (ground-penetrating radar, impact-echo method, ultrasound), their potentials, limitations and advantages when combined during the survey of stone coats of structures. Further on, the methodology indicates the process of the measurement itself and evaluation of the collected data.
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