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Gewählte Master / Diploma Thesis:

Barbara Fuerst (2006): Beurteilung der Dauerhaftigkeit von Lärchenholz anhand des Aufsaugverhaltens.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 124. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Larch wood belongs to one of the most durable coniferous woods in Europe. As such it is a desirable material for the use of numerous exterior applications. Therefore the contact with water is often present and water absorption is difficult to avoid. The aim of this diploma thesis is to analyse the water absorption of larch wood from different sites and provenance within specific time periods. The outer heartwood soaks up slowly and less water than the samples of the juvenile inner part. The strongest water absorption can be found at sapwood samples. Furthermore it has been established that trees from a high elevation absorb less water than those in the lowlands. However, the differences are decreasing with the duration of the experiment that after one week immersion no significant distinction can be found. Wetting periods in Europe are unlikely to last over several weeks because they are intermitted by drying phases. Therefore larch from higher elevation can be assumed to show better performance in exterior applications. By the use of simple and partial correlation analysis it was possible to evaluate the interactions between the characteristics of wood and water uptake. Among others ring width, cell wall thickness and extractive content have shown a direct relationship. A significant positive correlation could also be found between the mass loss due to fungus and water absorption. With increasing tendency of water absorption the durability of larch wood therefore decreases.

Beurteilende(r): Wimmer Rupert

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