Effect of Natural Aging on Oak Wood Fire Resistance
The paper deals with the assessment of the age of oak wood (0, 10, 40, 80 and 120 years) on its fire resistance. Chemical composition of wood (extractives, cellulose, holocellulose, lignin) was determined by wet chemistry methods and elementary analysis was performed according to ISO standards. From...
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doaj-8888167cc98a45bcb1bac123ffe41edb2021-07-15T15:43:24ZengMDPI AGPolymers2073-43602021-06-01132059205910.3390/polym13132059Effect of Natural Aging on Oak Wood Fire ResistanceMartin Zachar0Iveta Čabalová1Danica Kačíková2Tereza Jurczyková3Department of Fire Protection, Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, 960 53 Zvolen, SlovakiaDepartment of Chemistry and Chemical Technologies, Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, 960 53 Zvolen, SlovakiaDepartment of Fire Protection, Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, 960 53 Zvolen, SlovakiaDepartment of Wood Processing, Czech University of Life Sciences in Prague, Kamýcká 1176, 16521 Praha 6-Suchdol, Czech RepublicThe paper deals with the assessment of the age of oak wood (0, 10, 40, 80 and 120 years) on its fire resistance. Chemical composition of wood (extractives, cellulose, holocellulose, lignin) was determined by wet chemistry methods and elementary analysis was performed according to ISO standards. From the fire-technical properties, the flame ignition and the spontaneous ignition temperature (including calculated activation energy) and mass burning rate were evaluated. The lignin content does not change, the content of extractives and cellulose is higher and the content of holocellulose decreases with the higher age of wood. The elementary analysis shows the lowest proportion content of nitrogen, sulfur, phosphor and the highest content of carbon in the oldest wood. Values of flame ignition and spontaneous ignition temperature for individual samples were very similar. The activation energy ranged from 42.4 kJ·mol<sup>−1</sup> (120-year-old) to 50.7 kJ·mol<sup>−1</sup> (40-year-old), and the burning rate varied from 0.2992%·s<sup>−1</sup> (80-year-old) to 0.4965%·s<sup>−1</sup> (10-year-old). The difference among the values of spontaneous ignition activation energy is clear evidence of higher resistance to initiation of older wood (40- and 80-year-old) in comparison with the younger oak wood (0- and 10-year-old). The oldest sample is the least thermally resistant due to the different chemical composition compared to the younger wood.https://www.mdpi.com/2073-4360/13/13/2059oak woodhistorical woodchemical compositionflame ignition temperaturespontaneous ignition temperatureactivation energy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martin Zachar Iveta Čabalová Danica Kačíková Tereza Jurczyková |
spellingShingle |
Martin Zachar Iveta Čabalová Danica Kačíková Tereza Jurczyková Effect of Natural Aging on Oak Wood Fire Resistance Polymers oak wood historical wood chemical composition flame ignition temperature spontaneous ignition temperature activation energy |
author_facet |
Martin Zachar Iveta Čabalová Danica Kačíková Tereza Jurczyková |
author_sort |
Martin Zachar |
title |
Effect of Natural Aging on Oak Wood Fire Resistance |
title_short |
Effect of Natural Aging on Oak Wood Fire Resistance |
title_full |
Effect of Natural Aging on Oak Wood Fire Resistance |
title_fullStr |
Effect of Natural Aging on Oak Wood Fire Resistance |
title_full_unstemmed |
Effect of Natural Aging on Oak Wood Fire Resistance |
title_sort |
effect of natural aging on oak wood fire resistance |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2021-06-01 |
description |
The paper deals with the assessment of the age of oak wood (0, 10, 40, 80 and 120 years) on its fire resistance. Chemical composition of wood (extractives, cellulose, holocellulose, lignin) was determined by wet chemistry methods and elementary analysis was performed according to ISO standards. From the fire-technical properties, the flame ignition and the spontaneous ignition temperature (including calculated activation energy) and mass burning rate were evaluated. The lignin content does not change, the content of extractives and cellulose is higher and the content of holocellulose decreases with the higher age of wood. The elementary analysis shows the lowest proportion content of nitrogen, sulfur, phosphor and the highest content of carbon in the oldest wood. Values of flame ignition and spontaneous ignition temperature for individual samples were very similar. The activation energy ranged from 42.4 kJ·mol<sup>−1</sup> (120-year-old) to 50.7 kJ·mol<sup>−1</sup> (40-year-old), and the burning rate varied from 0.2992%·s<sup>−1</sup> (80-year-old) to 0.4965%·s<sup>−1</sup> (10-year-old). The difference among the values of spontaneous ignition activation energy is clear evidence of higher resistance to initiation of older wood (40- and 80-year-old) in comparison with the younger oak wood (0- and 10-year-old). The oldest sample is the least thermally resistant due to the different chemical composition compared to the younger wood. |
topic |
oak wood historical wood chemical composition flame ignition temperature spontaneous ignition temperature activation energy |
url |
https://www.mdpi.com/2073-4360/13/13/2059 |
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