Retardation Effect on Thermally-Modified Spruce Wood

Osvaldová, Linda Makovická; Gaff, Milan

doi:10.2495/sdp170471

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Result shows that the weight loss rate decrease with an increase in heat temperature especially beech and oak woods. Osvaldová and Gaff [25] studied that different thermal modifications and the influence of fire retardant on combustion properties of thermally modified spruce (Picea abies L.) wood. They reported that the highest burning rate has been reached with heat-treated samples at 210°C.…”

Section: Resultsmentioning

confidence: 99%

Impact Of Heat Treatment On Weight Loss During Combustion Of Laminated Veneer Lumber (LVL)

Perçin¹,

Altunok²

2018

Journal of Polytechnic

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This study was performed to determine the effects of heat treatment on weight loss during combustion of the laminated wood materials produced from Oriental beech (Fagus orientalis L.), scotch pine (Pinus sylvestris L.), sessile oak (Quercus petraea L.), and poplar (Populus nigra L.) veneers bonded with PVAc-D4, PUR and MF adhesives. For this aim, the weight loss during combustion of the test samples was determined according to ASTM E 160-50. The results of this study indicated that the weight loss percentage was the highest in poplar wood (89.17%), PVAc-D4 adhesive (89.79%) and control samples (88.69%). In the interaction of the wood materials and type of adhesive, the highest value was measured in poplar+PUR (90.93%), interaction of the wood materials and heat treatment in poplar + control samples (90.87%), in the interaction of the type of adhesive and heat treatment in PVAc-D4 + 185 °C (91.10%). In the interaction of the wood material, type of adhesive and heat treatment temperature, the highest value was determined in laminated control poplar samples with PUR adhesive (93%), while the lowest in laminated scotch pine samples with MF and heat-treated at 185 °C (81.83%). The use of laminated and heat-treated wood material in places where in high risk of fire, impregnation of wood material with fire-retardant compounds can be suggested.

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Section: Resultsmentioning

confidence: 99%

Impact Of Heat Treatment On Weight Loss During Combustion Of Laminated Veneer Lumber (LVL)

Perçin¹,

Altunok²

2018

Journal of Polytechnic

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“…Surface treatment of the boards was performed by planing (with a combined woodworking machine Woodster C6 06, Woodster GmbH, Ichenhausen, Germany). Surface roughness is one of the factors influencing the ignition of samples [42]. The average density of the tested spruce wood samples was 422.9 kg•m −3 and beech wood was 697.2 kg•m −3 .…”

Section: Parametersmentioning

confidence: 99%

Study of the Influence of Heat Flow on the Time to Ignition of Spruce and Beech Wood

Harangozó,

Tureková,

Marková

et al. 2024

Applied Sciences

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Adherence to fire safety regulations for wood is one of the most important tasks in its use in structural and architectural applications. This article deals with determining the influence of heat flux on the ignition process of spruce (Picea abies L. Karst.) and beech wood (Fagus sylvatica L.). The heat flux was generated by an electric radiant panel. The analysed parameters included the ignition time of the spruce and beech wood samples, the influence of wood density, and sample moisture, and the course of sample combustion, both with and without flame, was observed. The heat flux was maintained at constant values, depending on the distance of the examined sample from the panel, along with the specific power of the radiation panel. The power of the radiation panel was set to constant values of 5 kW and 10 kW. The samples were placed at distances of 50, 70, 100, 150, and 200 mm from the heat source, and heat fluxes in the range of 13–92 kW·m−2 were observed. At a power of 5 kW and a heat flux of 64 kW·m−2, neither the sample of beech nor that of spruce wood, placed at the distance of 100 mm from the radiation panel, exhibited flaming combustion. The ignition time for the beech wood was approximately twice that of the spruce wood, likely due to the higher average wood density. It can be stated that wood density, as one of the main factors, significantly influences the ignition phase of burning. The statistical analysis examined variables including wood type, radiant panel output, distance, and heat flux in relation to ignition time. The analysis revealed a significant difference between ignition time and distance (p-value = 0.0000, H = 37.51583) as well as between ignition time and heat flux (p-value = 0.0000, H = 37.69726). Similarly, the time to ignition for all tested beech wood samples was longer than for spruce wood.

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“…Test results showed that heat treatment showed positive effects on the fire safety of Larix wood, weakening the intensity of its combustion properties and also reducing the ignition time. Osvaldová and Gaff [33] determined retardation effect on heat-treated spruce wood. They reported that, heat-treated fire retardant treated samples have lower weight losses than non-treated samples.…”

Section: Statistical Analysesmentioning

confidence: 99%