Selected mechanical and physical properties of thermally modified wood after field exposure tests

Dong, Huijun (author), Hasanagić, Redžo (author), Fathi, Leila (author), Bahmani, Mohsen (author), Kržišnik, Davor (author), Keržič, Eli (author), Humar, Miha (author)

This study aimed to evaluate the impact of thermal modification on the physical and mechanical properties of three different wood species from Bosnia and Herzegovina, namely beech wood (Fagus sylvatica L.), linden wood (Tilia cordata), and silver fir wood (Abies alba). The samples underwent thermal modification at five different temperatures (170 °C, 180 °C, 195 °C, 210 °C, and 220 °C) for varying durations (ranging from 78 to 276 min). After treatment, they were exposed to outdoor conditions for twelve months. The study examined the four-point bending strength, tensile force, color change, and surface quality of the modified and unmodified samples. The results showed that outdoor exposure negatively impacted the mechanical properties of the unmodified samples, especially in the linden wood which was 41% and the beech wood which was 42%. Additionally, outdoor exposure caused significant surface cracks in the thermally modified linden and beech wood. The study also found prominent color changes in the modified and unmodified samples during twelve months of exposure. The roughness of the samples was determined with a confocal laser scanning microscope, which showed that the roughness increased on both the axial and the longitudinal surfaces after weathering. The highest roughness for the fir wood was determined to be 15.6 µm. Overall, this study demonstrates the importance of wood modification and its impact on the use-value of wood products.

• Language: English
• Keywords: wood, thermal modification, surface roughness, colour, mechanical properties, physical properties
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Publication date: 12.05.2023
• Year: 2023
• Number of pages: Str. 1-14
• Numbering: Vol. 14, iss. 5
• PID: 20.500.12556/RUL-146017
• UDC: 630*8
• ISSN on article: 1999-4907
• DOI: 10.3390/f14051006
• COBISS.SI-ID: 152107267
• Publication date in RUL: 18.05.2023

Record is a part of a journal

• Title: Forests
• Shortened title: Forests
• Publisher: MDPI
• ISSN: 1999-4907
• COBISS.SI-ID: 3872166

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: les, termična modifikacija, hrapavost površine, barva, mehanske lastnosti, fizikalne lastnosti