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Open AccessArticle

Moisture-Dependent Strength Properties of Thermally-Modified Fraxinus excelsior Wood in Compression

Department of Wood Science and Thermal Techniques, Faculty of Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 38/42, 60-637 Poznań, Poland
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Materials 2020, 13(7), 1647; https://doi.org/10.3390/ma13071647
Received: 17 March 2020 / Revised: 28 March 2020 / Accepted: 30 March 2020 / Published: 2 April 2020
(This article belongs to the Section Materials Physics)
European ash (Fraxinus excelsior L.) is one of the species commonly used for wood thermal modification that improves its performance. The presented research aimed to investigate a moisture-dependent strength anisotropy of thermally-modified European ash in compression. Wood samples were modified at 180 °C and 200 °C. Their mechanical parameters were determined in the principal anatomical directions under dry (moisture content of 3%) and wet (moisture content above fibre saturation point) conditions. Effect of heat treatment temperature and moisture content on the ash wood mechanical parameters concerning each anatomical direction were determined. The results show that thermal treatment kept the intrinsic anisotropy of wood mechanical properties. It decreased wood hygroscopicity, which resulted in improved strength and elasticity measured for wet wood when compared to untreated and treated samples. Higher treatment temperature (200 °C) increased wood elasticity in compression in all the anatomical directions despite wood moisture content during the measurements. Multivariate analysis revealed that the modification temperature significantly affected the modulus of elasticity perpendicular to the grain, while in the case of compression strength, the statistically significant effect was observed only parallel to the grain. The results obtained can be useful from an industrial perspective and can serve as part of a database for further modelling purposes. View Full-Text
Keywords: compressive strength; ash; wood thermal modification; moisture content; mechanical properties compressive strength; ash; wood thermal modification; moisture content; mechanical properties
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MDPI and ACS Style

Roszyk, E.; Stachowska, E.; Majka, J.; Mania, P.; Broda, M. Moisture-Dependent Strength Properties of Thermally-Modified Fraxinus excelsior Wood in Compression. Materials 2020, 13, 1647.

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