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Gewählte Master / Diploma Thesis:

Michael Reitberger (2010): Vergleichende Studie von Terrassendeckings Untersuchungen zur Stabilität der mechanischen Eigenschaften von Holz- und WPC-Terrassendeckings unter Extrembedingungen.
Master / Diploma Thesis - Institut für Holzforschung (IHF), BOKU-Universität für Bodenkultur, pp 182. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Eleven terrace-deckings were examined in terms of the stability of their mechanical properties under extreme conditions. In total six wood products (two thermal-treated boards, two tropical wood species and two local wood species) and five WPC products from different manufacturers were examined. Mechanical properties as modulus of elasticity, modulus of rupture and total deflection were measured by means of a three point bending test at three temperature levels (20, 50, 70 °C). Data of these samples served as reverence values. With another sample set (same sample size) a cycle-test (accelerated weathering) in accordance with DIN EN 321 was performed. The cycle-test demands three cycles within water storage, freezer storage and a drying process for every cycle. After the cycle-test the specimens were tested accordingly to the reference sample set and the results were statistically compared to the reference values. The results showed decreasing strength and stiffness values for WPC deckings at increased temperature levels. However, a significant reduction of mechanical properties due to the cycle-testing could not be observed for WPC samples. On the other hand wooden deckings showed a higher statistical spread after the cycle-test in comparison to the reference samples. A subsequent visual examination of the specimen demonstrated, that, especially Massaranduba (Manilkara bidentata) tended to end-grain cracking, Larch (Larix decidua) and Ash (Fraxinus excelsior) showed extensive longitudinal cracks. By contrast WPC deckings subjected to the cycling test showed neither deformation nor any notable cracks.

Beurteilende(r): Müller Ulrich

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