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.
Highlights
Gypsum is known to be one of the oldest building material that uses from ancient times
The highest water absorption value was found in C5 type board as 45.5 % after 24h soaking in water
It was seen that the best thickness swelling was observed from C1 with the thickness swelling 0.2%, while the worst thickness swelling given by board C5 with 2.2%
Summary
Gypsum is known to be one of the oldest building material that uses from ancient times. It is an environmentally friendly building material, with energy-saving, constructability, sound insulation, thermal insulation, decoration materials, availability, low price, ease of production and other advantages. Gypsum has been used as an insulation material in buildings since the 1900s. It was indicated that worldwide energy consumption has been increasing in the buildings more than 30%. This rate is up to 40% in some countries such as in Turkey on the buildings in recent years. Reducing the energy consumption in structures by improving their thermal performance can dicrease mentioned rate above (Sharifi et al 2017)
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