INNOVATIVE COMPOSITIONS OF STRUCTURAL ELEMENTS AND THEIR ESTIMATED FIRE RESISTANCE
Keywords:
structural element; magnesium oxide board; thermal insulation core; expected fire resistance; medium-scale test.Abstract
The paper is focused on the investigation of innovative compositions of structural elements suitable mainly for use in timber constructions, with respect to determining their expected fire resistance. The examined compositions of structural elements meet several requirements that contribute to both the energy efficiency and fire safety of buildings. The tested structures consisted of magnesium oxide boards forming the sheathing of the samples, combined with various types of thermal insulation cores (PUR foam, paper honeycomb, and straw mixed with MgO mortar). The expected fire resistance was determined by conducting medium-scale fire tests simulating the progression of a fully developed compartment fire. The samples were exposed to radiant heat from a radiation panel with an output of 20 kW·m⁻². The best results were achieved by the sample containing the straw and MgO mortar mixture, which reached an estimated fire resistance of 90 to 120 minutes, confirming the suitability of this material combination in the composition of the structural element. The sample with the honeycomb core achieved an assumed fire resistance of 30 to 45 minutes, while the sample with PUR thermal insulation had the lowest, at 15 minutes.
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Copyright (c) 2025 Ľudmila Tereňová, Daria Mokrenko, Mária Kozlovská
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