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Foamed gypsum composite with heat-resistant admixture under high temperature: Mechanical, thermal and deformation performances

机译:高温下具有耐热混合物的泡沫石膏复合材料:机械,热和变形性能

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摘要

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/m(3), 650 kg/m(3)), foamed gypsum with glass fiber or with expanded vermiculite were tested in the temperature range of 25 degrees C-800 degrees 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.
机译:本文提出了研究暴露于高温的机械石膏的机械,热和变形性能的实验研究。 纯石膏,具有不同密度的普通发泡石膏(800kg / m(3),650kg / m(3)),用玻璃纤维或膨胀蛭石在25℃-800度的温度范围内进行测试 C.结果表明,低密度普通泡沫石膏在高温下产生的热裂纹较少。 此外,玻璃纤维的掺入可以在玻璃纤维熔化之后增加石膏复合材料的热收缩和裂缝,而扩张的蛭石可显着益处在高温下降低石膏复合材料的机械强度,收缩和裂缝的损失 。 最后,讨论了与物理,化学和微观结构转化相关的机械强度大幅度变化的机制。

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