Fungicide efficacy of nanofibre textiles containing chemical preservatives for protection of wooden materials – preliminary study

The aim of presented work was to verify a possible application of nanofibre polyvinyl alcohol (PVA) textiles doped with commercially available biocides for chemical preservation of wooden materials. Fungicide efficacy of biocides based on Propiconazole, Tebuconazole, IPBC was evaluated on Norway spruce samples (Picea abies Karst. L.) 25 x 25 x 4 mm covered by the nanofibre textiles, against the wood destroying fungus Coniophora puteana during 28 days. Decay resistance of spruce samples with the fungicidally treated layer was valued on the base of weight loss (Δm) criteria. The durability of spruce samples significantly increased after incorporation of fungicides into the nanofibre textiles (Δm from 0.2 to 3.7 %), but the influence of the stabilization process was also reflected.

Correlations and differences between methods for non-destructive evaluation of timber elements

The aim of this paper is to compare the results of evaluation of mechanical properties of timber by visual assessment, two grading machines, three devices for measuring in-situ and destructive tests. The most important result is the comparison of static and dynamic modulus of elasticity of timber, and further comparison of strength classes obtained by different measuring methods.