Properties of Gypsum Boards Made with Cedrus Tree (Cedrus libani) Components. Part 2. Chemical and Technological Properties

Abstract

In this study, the variation of cedrus tree parts and gypsum during experimental panel manufacturing have been evaluated. The burning pattern on the surface of all test boards produced by adding cedrus’s tree components (wood, bark, cone and needle) as reinforcement fillers to the gypsum structure did not reach the threshold limit of 150 mm that specified in the standard value as ISO 11925-2 standard but only limi-ted spreading of char was observed. It was also found that cone looks like create better barrier against heat compare to needle, wood and bark in similar proportions with gypsum. In contrary, although bark could be absorbed and barrier to heat better than others but it may not support flammability that are not support to mass lost when subject to burning. Some chemical changes occurred in main constituents of lignocellu-losic substances in water/gypsum mixture as evidence with FTIR spectrums. It has also realized that bark (SKa6), cone (Sko6), and needle (SI6) in gypsum negative impact on thermal degradation that higher tempe-rature for decomposition compare to wood-based board (Ska1) at similar experimental manufacturing conditions. It has clearly seen that content of fillers dramatically effects thermal stability of gypsum based boards.

Keywords

• Gypsum board
• FTIR
• thermal stability
• burning properties

Sedir Ağacının (Cedrus libani) Farklı Kısımlarından Üretilmiş Alçı Levhaların Özellikleri. 2. Bölüm. Kimyasal ve Teknolojik Özellikler

Öz

Öz-Bu çalışmada, sedir ağacının değişik kısımları ile alçı karışımından elde edilen deneysel levhalar üretilmiştir. Yanma deneylerinde, bütün sedir ağaç kısımların (odun, kozalak, kabuk, ibre) alçı yapısına ilave edilmesiyle üretilmiş deneysel panellerin yüzey yanma durumları, as ISO 11925-2 standardına göre 150 mm lik seviyeye ulaşmamış, sadece sınırlı bir yüzey yanma yayılımı gözlemlenmiştir. Ayrıca sedir kozalağı diğer ibre, odun ve kabuk karışımından üretilen alçı esaslı levhalara göre daha fazla engel oluşturduğu anlaşılmıştır. Bu duruma karşı olarak ise, kabuk daha fazla ısıyı absorpladığı ve daha iyi engel oluşturduğu gözlemlenmekle birlikte, yanma esnasında kütle kaybı üzerine olumlu etkisi gözlemlenememiştir. Lignoselülozik maddelerin (odun, kabuk, ibre, kozalak) su/alçı karışımı içerisinde bazı kimyasal değişimlere uğradığı FTIR analizleri ile gözlemlenmiştir. Benzer koşullarda üretilen kabuk (SKa6), kozalak (Sko6) ve ibre (SI6) ilavesinin alçı esaslı levhaların termal bozulması üzerine, odun esaslı levhalar göre (Ska1) negatif etki ettiği belirlenmiştir. Çalışmada alçı yapısına ilave edilen katkı maddelerinin alçı esaslı levhaların termal dayanım özellikleri üzerine etki ettiği belirlenmiştir.

Anahtar Kelimeler

• Alçı levha
• FTIR
• termal dayanım
• yanma özelliği

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