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Journals / Ağaç ve Orman / 2026 / Cilt: 6 Sayı: 1

Dimensional Stability of Heat-Treated Wood Materials

Isıl İşleme Tabi Tutulmuş Ahşap Malzemelerin Boyutsal Stabilitesi

Vahit Eşener(BURSA TECHNICAL UNIVERSITY)0009-0000-1646-5492
Eylem Dizman Tomak(BURSA TEKNİK ÜNİVERSİTESİ)0000-0001-8654-0005
Pages
69–75
Publication Date
2025-06-26
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Among the 6 species tested, the lowest dimensional stability was found in iroko wood.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The moisture content and dimensional stability of wood are crucial physical properties that influence its end-use performance.
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Key Findings & Data:Schum), iroko (Milicia excelsa), ash (Fraxinus spp.) and pine (Pinus sylvestris) timbers were subjected to thermal modification at 212°C in an industrial heat treatment factory.
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Conclusion & Impact:Among the 6 species tested, the lowest dimensional stability was found in iroko wood.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Ahşap · boyutsal stabilizasyon · ısıl işlem

Abstract

The moisture content and dimensional stability of wood are crucial physical properties that influence its end-use performance. In this study, oak (Quercus spp.), tulip (Dalbergia decipularis), ayous (Triplochiton scleroxylon K. Schum), iroko (Milicia excelsa), ash (Fraxinus spp.) and pine (Pinus sylvestris) timbers were subjected to thermal modification at 212°C in an industrial heat treatment factory. Samples with dimensions of 20x20x30 mm were cut from both thermally modified and unmodified (control) timbers. Ten samples were used for each sample group. After measuring the oven-dry weight and dimensions of the specimens initially determined, then they were immersed in water for 5 days, and the oven-dry weight and dimensions were measured again at the end of this period. This cycle was repeated 2 times. In the experiment, the water uptake rate (%), water-repellent efficiency (%), volumetric swelling coefficient (%), and dimensional stability (%) of the specimens were calculated. As a result, the lowest water uptake rate among the thermally modified samples compared to their controls was observed in oak and ayous wood. In terms of water-repellent efficiency, the effect of heat treatment was found to be lower in pine and tulip samples compared to other wood species. The volumetric swelling coefficient was found to be significantly lower in heat-treated ash, pine, tulip, and oak compared to their controls. Among the 6 species tested, the lowest dimensional stability was found in iroko wood.

Özet

Ahşabın boyutsal kararlılığı ve nem içeriği, onun nihai kullanımını etkileyen önemli fiziksel özelliklerdendir. Bu çalışmada, meşe (Quercus spp.), sarı kavak (Dalbergia decipularis), ayous (Triplochiton scleroxylon K. Schum), iroko (Milicia excelsa), dişbudak (Fraxinus spp.) ve çam (Pinus sylvestris) türlerine ait keresteler endüstriyel bir ısıl işlem tesisinde 212°C’de termal modifikasyona tabi tutulmuştur. Termal modifiyeli ve termal modifiyesiz (kontrol) kerestelerden 20x20x30 mm boyutlarında örnekler kesilmiştir. Her grup için 10 adet örnek kullanılmıştır. Tam kuru ağırlık ve boyutları belirlenen örnekler, daha sonra suyun içerisinde 5 gün boyunca bekletilmiş ve süre sonunda tekrar tam kuru ağırlık ve boyutları alınmıştır. Bu döngü 2 kez tekrarlanmıştır. Deneyde örneklerin su alma oranı (%), su itici etkinliği (%), hacimsel genişleme katsayısı (%) ve boyutsal stabilitesi (%) hesaplanmıştır. Sonuç olarak, termal modifiyeli örneklerde kontrollerine kıyasla en az su alma oranı meşe ve ayous odununda görülmüştür. Su itici etkinlik açısından, çam ve sarı kavak örneklerde ısıl işlemin etkisi diğer odun türlerine kıyasla daha düşük tespit edilmiştir. Hacimsel genişleme katsayısı ise, ısıl işlemli dişbudak, çam, sarı kavak ve nispeten meşede, kontrollerine kıyasla önemli ölçüde düşük bulunmuştur. Test edilen 6 tür arasında en düşük boyutsal stabilite iroko odununda tespit edilmiştir.

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Cite This Article

Eşener, V., Tomak, E. D. (2025). Dimensional Stability of Heat-Treated Wood Materials. Ağaç ve Orman, Cilt: 6 Sayı: 1, 69–75. https://doi.org/10.59751/agacorman.1670718

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