University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Markus Datler
(2014):
Untersuchung der Rissbildung bei thermisch modifiziertem Eschenholz.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe,
BOKU-Universität für Bodenkultur,
pp 180.
UB BOKU
obvsg
FullText
- Abstract:
- This master thesis examines the material properties of thermally modified ash timber. The starting point of this project was the request of a producer of thermally modified timber products (Mitteramskogler GmbH) to examine the quality of their terrace boards made from thermally modified ash timber and to identify any aspects to improve product quality. Thermal treatment represents an effective method in order to improve the durableness and dimensional stability of timber exposed to weathering and its outdoor usage. However, the thermal treatment induces an undesirable reduction in the strength and leads to an embrittlement of the timber, thus increasing the likelihood of crack formation. The experiments conducted during this project were designed and adapted according the requests and ideas of the company. The company’s aim was to examine the impact of (1) the speed of the cooling down of the timber following the thermal treatment, (2) the intensity of the thermal treatment, and (3) some wood and board characteristics on the strength and the formation of cracks during weathering. In order to examine the strength of the thermally modified timber, fracture energy tests for RL- and TL- crack propagation were conducted. As time constraints do not allow for the examination of the material under real time outdoor weathering, the performance of the material was assessed during a cyclic treatment according to ÖNORM EN 321. ÖNORM 321 defines a standardized procedure for the determination of the resistance of wood products against humidity using a cyclic treatment.
- Beurteilende(r): Müller Ulrich
- 1.Mitwirkender: Hansmann Christian