Sintering Behavior of Expanded Perlite Thermal Insulation Board: Modeling and Experiments

Abstract

A finite difference-based mathematical model for sintering behavior prediction was developed with determination of corresponding sintering kinetics for a new type of expanded perlite-based insulation board. The insulation board was developed in cooperation between the company Trimo, d. d., and the Faculty of Chemistry and Chemical Technology of the University of Ljubljana.The board was produced by mixing expanded perlite with prescribed particle size and sodium silicate solution, molding and pressing the mixture and drying the so-formed board in a microwave cavity, followed by a high-temperature thermal treatment of the dried board. During the high-temperature thermal treatment of the board, certain shrinkage appeared, a result of a sintering process inside the board. A certain amount of shrinkage is needed for a board to obtain sufficient mechanical properties and to increase the durability of the insulation board in moistened conditions. During this process, the mathematical prediction of the sintering behavior is the key to achieve the right balance between the low final density, which is the basis for good thermal insulation properties, and good mechanical properties and durability, achieved only by allowing the material to reach the right sintering temperature.

Mathematical Calculation and Experimental Investigation of Expanded Perlite Based Heat Insulation Materials’ Thermal Conductivity Values

“…Obtained thermal conductivity values were changed between the 43.35 mW/m.K and 71.22 mW/m.K. The obtained results are in good agreement when compared with literature, 61.8 -189 mW/m.K [14], 45 mW/m.K [25].…”

“…Thermal conductivity coefficient of the expanded perlite was calculated as 45 mW/m.K. As the sodium silicate ratio decreased, the curing temperature increased [25].…”

İnşaat Sektöründe Kullanılan Yalıtım Malzemelerinin Isı ve Ses Yalıtımı Açısından Değerlendirilmesi

“…Sodyum silikat oranı % 30 olan numunelerin sinterleme sıcaklığı 700 °C olarak saptanmıştır. Genleştirilmiş perlit esaslı panelin ısı iletim katsayısı 0,0503 W/m.K olarak ölçülmüştür [22]. Skubic ve ark.…”

“…Dökme beton ile karşılaştırıldığında kuru karışım püskürtme betonunun özgül ısı kapasitesinin daha düşük olduğu belirlenmiştir [15]. Abidi, S., Nait-Ali, B., Joliff, Y., Favotto, C., ( 2015 [22]. Skubic ve ark.…”

An investigation of usability of expanded perlite in heat insulation technologies

“…Elde edilen GP numunelerin ısı iletim katsayısı 0.045 W/m.K olarak ölçülmüştür. Bağlayıcı olarak kullanılan sodyum silikat oranı kütlece %30 olan numunelerin optimum kürleme sıcaklığı 700 °C olarak belirlenmiş ve bu malzemenin ısı iletim katsayısı 0.0503 W/m.K olarak ölçülmüştür[18].Gandage ve diğ. (2013) GP'in kendinden sıkışan betonun ısıl özelliklerine etkisini değerlendirmek için çalışmalar yapmışlardır.…”