材料期刊网

研究硅酸盐水泥在20 ℃、200 ℃、400 ℃、600 ℃、800 ℃以及1000 ℃六个温度条件下的耐高温性能,通过外观变化,质量损失以及抗压强度等宏观数据表征硅酸盐水泥的耐高温性能,并通过扫描电镜(SEM)、X衍射分析(XRD)和差热分析(DTA)研究了硅酸盐水泥在不同温度下稳定性变化的机理.试验结果表明:硅酸盐水泥在400 ℃以下的温度,仍能保持一定程度的外观完整和抗压强度;当温度超过600 ℃时,其稳定性开始急剧下降,试件内部出现大量的蜂窝状孔洞,使得C-S-H凝胶被完全分解,导致强度完全丧失而被破坏.

High temperature resistance performance of portland cement in 20 ℃, 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃ was studied by the appearance change, mass loss and compressive strength in different high temperature.And the mechanism of stability change in different temperature of portland cement was studied by the scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and differential thermal analysis (DTA).The results indicate that the Portland cement still keep the unbroken appearance and compressive strength under 400 ℃.Conversely, it is a sharp drop in stability,and there are abound of alveolate viods within cement.Then C-S-H del is decomposed and compressive strength is loss when the temperature exceed 600 ℃ that there are abound of alveolate voids within cement result in the destruction of C-S-H gel and loss of compress strength.