Influence of the thermo-hydro-mechanical treatments of wood on the performance against wood degrading fungi Public Deposited

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  • Hybrid poplar (Populus deltoides × Populus trichocarpa) and Douglas-fir (Pseudotsuga menziesii) wood specimens were densified with three variations of Thermo-Hydro-Mechanical (THM) treatment. The THM treatments differed in the steam environment, including transient steam (TS), saturated steam (SS), and saturated steam with 1 minute post-heat-treatment at 200°C (SS+PHT). The bending properties, FTIR spectra, and color of the THM wood specimens were studied before and after exposure to two different wood decay fungi; brown rot Gloeophyllum trabeum and white rot Trametes versicolor. The results showed that the performance of densified hybrid poplar wood was considerably poorer than performance of Douglas-fir heartwood. The FTIR spectra measurements did not show changes in the densified hybrid poplar wood, while some changes were evident in densified Douglas-fir specimens. After fungal degradation the most prominent changes were observed on the SS+PHT specimens. Color is one of the most important parameter predominantly influenced by the wood species and the intensity of the densification process for both wood species, while after the fungal exposure the color of all densified Douglas-fir specimens became more or less of the same appearance and densified hybrid poplar specimens resulted in lighter color tones, indicating that the patterns of degradation of the densified and nondensified specimens are similar. The 3-point bending test results determined that the THM treatment significantly increased the modulus of rupture (MOR) and modulus of elasticity (MOE) of the densified wood specimens, while the fungal exposure decreased the MOE and MOR in hybrid poplar and Douglas-fir specimens.
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  • Lesar, B., Humar, M., Kamke, F. A., & Kutnar, A. (2013). Influence of the thermo-hydro-mechanical treatments of wood on the performance against wood-degrading fungi. Wood Science and Technology, 47(5), 977-992. doi:10.1007/s00226-013-0553-8
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  • 47
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  • 5
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  • The project was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2006-35504-17444 and USDA Wood Utilization Research Center Special Grant number 2008-34158-19302. The authors would like to thank the Slovenian Research Agency for financial support within the frame of project P4-0015-0481.
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