The development of LVL from modified European beech (Fagus sylvatica L.) veneer aims at a utilization in load bearing constructions outdoors. In most applications, these constructions are endangered by attack of basidiomycetes, such as white and brown rot fungi. Lab tests have already proven the high durability of wood composites made from veneer, which was modified with low molecular weight phenolic resins. Due to their high mechanical strength they might be applicable also for utility poles. In soil soft rot fungi can cause strength losses of untreated wood. Against the background of a future creosote ban and an increasing copper tolerance of fungi, an alternative is wanted. The durability of LVL made from phenol-formaldehyde (PF) modified beech veneers in ground contact was validated under field conditions. Before testing full-scale poles, LVL samples from lap scale boards were tested including a variety of resins and board production parameters. Graveyard tests according to EN 252 (2015) were performed at Goettingen University and first results are presented.
Keywords: soft rot fungi, durability, European beech, decay
Authors
Sascha Bicke
Georg-August-Universität Göttingen, Germany
Christian Brischke
Vladimirs Biziks
Holger Militz
Login to download the PDF