YAŞLANDIRMA SONRASI KAYIN ODUNUNDA ÇÜRÜME ETKİSİ
Ahşap, dış mekan uygulamalarında foto degredasyona karşı hassastır ve yüzeyinde mikro veya makro çatlaklar, renk değişiklikleri gibi deformasyonlar meydana gelir. Özellikle çatlaklar, ahşap malzemeyi biyotik saldırılara karşı daha savunmasız hale getirir. Bu çalışmada, doğal ve hızlandırılmış UV yaşlandırma testi uygulanmış kayın örneklerinin esmer (Coniophora puteana) ve beyaz çürüklük (Coriolus versicolor) mantar saldırılarına karşı dayanımı araştırılmıştır. Bu amaçla, 393 gün boyunca doğal dış ortam testi (NW) ve 1512 saat süreyle hızlandırılmış UV yaşlandırma testine (AW) maruz kalan kayın örnekleri, 2 ve 4 hafta boyunca agar ortamında çürüme testine tabi tutulmuştur. 2 haftalık bozunma testinden sonra, C. versicolor ile numunelerin ağırlık kaybı kontroller için %24.30, AW numuneleri için %13.29 ve NW numuneleri için %24.38 olarak bulunmuştur. C. puteana durumunda kontroller, AW örnekleri ve NW örnekleri için sırasıyla %21.15, %21.49 ve %30.61 olarak bulunmuştur. C. versicolor ile numunelerin ağırlık kaybı, 4 haftalık bozulma testinden sonra kontroller için %61.82, AW numuneleri için %30.72 ve NW numuneleri için %37.62 olarak bulunmuştur. C. puteana'nın 4 haftalık maruziyetiyle ağırlık kaybı, kontroller, AW örnekleri ve NW örnekleri için sırasıyla %21.43, %8.44 ve %37.67 olarak bulunmuştur. Doğal dış ortam testi, her iki mantar türü için hızlandırılmış yaşlandırma testinden daha fazla ağırlık kaybına neden olmuştur.
Anahtar Kelimeler:
beyaz çürüklük, esmer çürüklük, doğal dış ortam testi, hızlandırılmış yaşlandırma testi, kayın
Decay Resistance of Weathered Beech Wood
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.
Keywords:
White rot, brown rot, natural weathering, accelerating weathering, beech,
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- Yayın Aralığı: Yılda 4 Sayı
- Başlangıç: 2016
- Yayıncı: Bülent VEREP
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