Fire resistance of one-sided surface-charred silver fir and European ash timber
Abstract
Abstract The aim of this work was to investigate the fire resistance of silver fir ( Abies alba L. ) and European ash ( Fraxinus excelsior ) boards charred by the traditional yakisugi method and to compare the results with the fire resistance of non-charred boards as a reference. After the boards were surface charred on one side, specimens with different char thicknesses were selected from each wood species and subjected to analysis. Specimens with dimensions of 250×90 mm underwent a small flame test, those of 220×170 mm received indirect flame exposure by constant heat flux radiation from an infra-red emitter and those of 600×600 mm were subjected to a fire resistance test according to EN 1363-1:2020. The results of the small flame tests showed significant fire-resistance enhancement of specimens with a 6 and 3 mm char-layer thickness in fir and ash wood, respectively, and a 110% and 75% improvement when compared to reference specimens. The constant heat flux radiation tests did not reveal any significant differences between the reference and charred specimens. The up-scaled fire resistance test, in which an assembled panel was exposed to flame, also indicated significant improvement. The reference burn-through time of fir and ash specimens was improved significantly with increasing char layer thickness, resulting in 10–26% of fire resistance improvement for fir and 5–12% for ash wood specimens. These results suggest that one-sided surface charring of wood can enhance its fire resistance; however, this was mostly achieved in boards with the thickest char layer in both wood species studied. Further in-depth studies are required to better understand the complex behaviour of charred wood in response to fire.
Reference
David Hans Ebner1; Marius-Catalin Barbu2; Ondřej Prokop; Petr Čermák. (2023). Fire resistance of one-sided surface-charred silver fir and European ash timber. Springer Science and Business Media LLC. https://doi.org/10.21203/rs.3.rs-3372266/v1
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