Physical, Mechanical and Thermal Properties of Red Pine Wood-Gypsum Particleboard

Abstract

Physical, mechanical and some thermal properties of gypsum-wood mixture particleboards were analyzed for specimens which were prepared in different proportions previously conditioned at 23 ˚C and 65% relative humidity. Water absorbtion (WA) and thickness swelling (TS) properties were measured after soaked in water for 24 hours. Furthermore, the increment of wood particle was increased the water absobtion values around 28.5 % and 2.1% thickness swelling values, respectively. However, the reduction of gypsum ratio was negatively effected the mechanical resistance of the boards. The highest MOR, MOE and internal bond (IB) values were observed in the C1 code board with 4.73 MPa, 27.04 MPa and 0.97 N/mm2 respectively. The thermal conductivty of wood-gypsum boards were ranged from 0.7404-0.5021 W/mK. The highest density was found in C1 type board as 1.333 kg/m³ and also the highest thermal coductivity was observed at the same sample. Besides, the highest surface temprature which was passed to opposite side of flame source, was found in C5 as 141.7 oC after 300 seconds. However, the lowest value was observed in C1 type board as 93.3 ˚C after 300 seconds.

Keywords

• Physical properties
• mechanical properties
• thermal properties
• gypsum
• wood
• particleboard

Kızılçam Odun-Alçı Yonga Levhanın Fiziksel, Mekanik ve Termal Özellikleri

Abstract

Farklı oranlarda hazırlanan, 23 ° C'de ve % 65 bağıl nemde iklimlendirilen numuneler için alçı-ahşap karışımı yonga levhaların fiziksel, mekanik ve bazı ısıl özellikleri analiz edilmiştir. 24 saat suya batırıldıktan sonra su emme (WA) ve kalınlık şişme (TS) özellikleri ölçülmüştür. Ayrıca, odun katkısının artışı, su emme değerlerini sırasıyla %28.5 ve kalınlık şişme değerlerini %2,1 civarında artırmıştır. Ancak alçı oranının azalması levhaların mekanik direncini olumsuz yönde etkilemiştir. En yüksek MOR, MOE ve IB değerleri sırasıyla 4.73 MPa, 27.04 MPa ve 0.97 N / mm2 ile C1 kodlu levhada gözlenmiştir. Ahşap alçı levhaların ısıl iletkenliği 0.7404-0.5021 W/mK arasında değişmiştir. En yüksek yoğunluk 1.333 kg/m³ olarak C1 tipi levhada bulunmuş ve en yüksek ısıl iletkenlik aynı numunede gözlenmiştir. Ayrıca alev kaynağının karşı tarafına geçen en yüksek yüzey sıcaklığı 300 saniye sonra 141.7 °C olarak C5'te bulunmuştur. Ancak en düşük değer 300 saniye sonra 93.3 ˚C olarak C1 tipi levhada gözlenmiştir.

Keywords

• Fiziksel özellikler
• mekanik özellikler
• termal özellikler
• alçı
• odun
• yonga levha

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