Institute of Fundamental Technological Research
Polish Academy of Sciences


E. Krawczyk

Recent publications
1.  Ranachowski Z., Ranachowski P., Dębowski T., Brodecki A., Kopeć M., Roskosz M., Fryczowski K., Szymków M., Krawczyk E., Schabowicz K., Mechanical and non-destructive testing of plasterboards subjected to a hydration process, Materials, ISSN: 1996-1944, DOI: 10.3390/ma13102405, Vol.13, No.10, pp.2405-1-18, 2020

The aim of this study was to investigate the effect of plasterboards' humidity absorption on their performance. Specimens' hydration procedure consisted of consecutive immersing in water and subsequent drying at room temperature. Such a procedure was performed to increase the content of moisture within the material volume. The microstructural observations of five different plasterboard types were performed through optical and scanning electron microscopy. The deterioration of their properties was evaluated by using a three-point bending test and a subsequent ultrasonic (ultrasound testing (UT)) longitudinal wave velocity measurement. Depending on the material porosity, a loss of UT wave velocity from 6% to 35% and a considerable decrease in material strength from 70% to 80% were observed. Four types of approximated formulae were proposed to describe the dependence of UT wave velocity on board moisture content. It was found that the proposed UT method could be successfully used for the on-site monitoring of plasterboards' hydration processes.

plasterboards, moisture content, hydration processes, mechanical properties, ultrasound measurements

Ranachowski Z. - IPPT PAN
Ranachowski P. - IPPT PAN
Dębowski T. - IPPT PAN
Brodecki A. - IPPT PAN
Kopeć M. - IPPT PAN
Roskosz M. - AGH University of Science and Technology (PL)
Fryczowski K. - Silesian University of Technology (PL)
Szymków M. - other affiliation
Krawczyk E. - other affiliation
Schabowicz K. - Wroclaw University of Science and Technology (PL)

Filing No./Date
Filing Publication
Protection Area, Applicant Name
Patent Number
Date of Grant
BUP 12/2022
Schabowicz K., Ranachowski Z., Dębowski T., Szymków M., Krawczyk E.
Device for determining gypsum hydration in plaster-boards
PL, Politechnika Wrocławska, Instytut Podstawowych Problemów Techniki PAN
WUP 31/2022

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