This paper presents an experimental study to investigate the mechanical, thermal and deformation properties of foamed gypsum exposed to high temperature. The pure gypsum, ordinary foamed gypsum with different densities (800 kg/m³, 650 kg/m³), foamed gypsum with glass fiber or with expanded vermiculite were tested in the temperature range of 25 °C-800 °C. The results show that the low density ordinary foamed gypsum generates less thermal cracks than the high density gypsum at elevated temperature. Furthermore, the incorporation of the glass fiber can increase the thermal shrinkage and cracks of the gypsum composite after the melting of glass fiber, while the expanded vermiculite can significantly benefit in reducing the loss of mechanical strength, shrinkage and cracks of gypsum composite at high temperature. Finally, the mechanisms of substantial changes of the mechanical strength related to physical, chemical and microstructural transformations were discussed.

本文提出了一项实验研究，以研究泡沫石膏在高温下的机械，热和变形性能。纯石膏，普通泡沫石膏具有不同密度（800千克/米³ 650千克/米³），在25°C-800°C的温度范围内测试了玻璃纤维或膨胀expanded石的泡沫石膏。结果表明，在高温下，低密度普通泡沫石膏产生的热裂纹少于高密度石膏。此外，玻璃纤维的掺入可增加玻璃纤维熔融后石膏复合材料的热收缩和开裂，而膨胀的ver石可显着降低高温下石膏的机械强度，收缩和开裂的损失。 。最后，讨论了与物理，化学和微观结构转变有关的机械强度发生实质性变化的机制。