Decay Resistance of Weathered Beech Wood
Öz
Wood is susceptible to photo-degradation in outdoor applications, and deformations occur on its surface such as micro or macro cracks, color changes etc. Especially, cracks make wood material more vulnerable to biotic attacks. In this study, decay resistance of natural and accelerated weathered beech samples was investigated by a brown (Coniophora puteana) and white rot (Coriolus versicolor) fungi attacks. For this purpose, beech samples exposed to natural weathering (NW) for 393 days, and accelerated weathering (AW) for 1512h, and then subjected to decay test in malt extract agar medium for 2 and 4 weeks. After 2 weeks of decay testing, weight loss of samples by C. versicolor was found to be 24.30% for controls, 13.29% for AW samples and 24.38% for NW samples. In the case of C. puteana, it was found as 21.15%, 21.49% and 30.61% for controls, AW samples and NW samples, respectively. Weight loss of samples by C. versicolor was found to be 61.82% for controls, 30.72% for AW samples and 37.62% for NW samples, after 4 weeks of decay testing. The weight loss by 4 weeks exposure of C. puteana was found to be 21.43%, 28.44% and 37.67% for controls, AW samples and NW samples, respectively. Natural weathering caused more weight loss than accelerated weathering test for both fungi species.
Anahtar Kelimeler
White rot, brown rot, natural weathering, accelerating weathering, beech
Destekleyen Kurum
Turkish Scientific and Research Council
Proje Numarası
118O759
Teşekkür
The authors are grateful to Sulekler Forest Industry, Bursa, Turkey for supplying the free-sample of woods materials. Weathering tests of this study was financially supported by Turkish Scientific and Research Council (TUBITAK) under the project number of 118O759
Kaynakça
- ASTM G154. (2006). Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials, American Society for Testing and Materials.
- ASTM G7. (2013). Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials.
- Bari, E., Nazarnezhad, N., Kazemi, S. M., Ghanbary, M. A. T., Mohebby, B., Schmidt, O., and Clausen, C. A. (2015). Comparison between degradation capabilities of the white rot fungi Pleurotus ostreatus and Trametes versicolor in beech wood. International Biodeterioration & Biodegradation, 104, 231-237.
- Brischke, C., and Meyer-Veltrup, L. (2015). Moisture content and decay of differently sized wooden components during 5 years of outdoor exposure. European Journal of Wood and Wood Products, 73(6), 719-728.
- Catto, A. L., Montagna, L. S., Almeida, S. H., Silveira, R. M., and Santana, R. M. (2016). Wood plastic composites weathering: Effects of compatibilization on biodegradation in soil and fungal decay. International Biodeterioration & Biodegradation, 109, 11-22.
- Chow, P., and Bajwa, D. S. (1998). Weathering effects on the decay resistance of creosote-treated oak. In V: Ninety-fourth annual meeting of the American Wood-preservers' Association. Scottsdale, Arizona Vol. 94.
- EN 113. (1997). Wood preservatives. Test method for determining the protective effectiveness against wood-destroying basidiomycetes. Determination of toxic values.
- EN 927-3. (2003). Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test.
- Evans P.D. (2008): Weathering and photo-degradation of wood. In: Development of Wood Preservative Systems, ACS Washington DC, USA: 69–117.
- George, B.; Suttie, E.; Merlin, A and Deglise, X. (2005). Photodegradation and photostabilisation of wood: The state of the art. Polym. Degrad. Stab. 88, 268–274.