Research of changes in the dynamic hardness of gypsum boards under the influence of thermal effects of fire
DOI:
https://doi.org/10.33408/2519-237X.2024.8-3.253Keywords:
inspection of the fire site, gypsum board, thermal damage, shock-pulse method, seat of fireAbstract
Purpose. To determine the change in the dynamic hardness of gypsum boards caused by exposure to high temperatures in order to establish the applicability of dynamic indentation of structures made from this material to assess the degree of thermal damage received in fire conditions.
Methods. Full-scale fire tests of gypsum boards. Dynamic indentation.
Findings. The possibility of assessing changes in the dynamic hardness of gypsum boards caused by exposure to elevated temperatures during a fire using the dynamic indentation method has been confirmed. Based on the fire tests of a frame-sheathing partition using a gypsum board of type H on a steel frame, the results of determining the change in the dynamic hardness of a gypsum board of the specified type are presented. In addition to the maximum temperature on the surface of the gypsum board, the heating time has a significant influence on the change in the indentation depth of the indenters. It was established that in different areas of the material surface at values of maximum (120–130 °C) and average (104–115 °C) temperatures and different heating times, the value of the indentation depth of the indenter differs by 1.5–2.0 times.
Application field of research. The obtained research results can be applied in the development a method for identifying the source of a fire based on the degree of thermal damage to structures made using gypsum boards.
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