高温激活氧化镁活性对硫氧镁水泥的影响

Effect of high temperature activated magnesium oxide activity on magnesium sulfide oxide cement

文中研究了失活氧化镁在高温激活下的活性恢复与MgO活性对水化产物的机械强度产生的影响。使用X射线衍射仪(XRD)、热重分析-差示扫描量热仪(TG-DSC)、扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FTIR)分析了不同活性的氧化镁影响试块性能的机理。结果表明:氧化镁的活性随灼烧温度的升高先增加后减小,在350℃最高,为41%。当失活MgO灼烧温度在200℃以下时,BMSC强度随温度上升而增大;当灼烧温度在200~350℃时,BMSC强度随温度的上升而减小;当温度大于350℃时,BMSC强度随温度上升而增大。

The activity recovery of metamorphic magnesium oxide(MgO)under high temperature activation and the effect of MgO activity on the mechanical strength of hydration products were studied.The mechanism by which different active MgO affects the properties of the test blocks was analyzed using X-ray diffractometer(XRD),thermogravimetric analysis differential scanning calorimetry(TG-DSC),scanning electron microscopy(SEM),and Fourier transform infrared spectroscopy(FTIR).The results show that the activity of MgO increases first and then decreases with the increase of sintering temperature,and reaching a maximum of 41%at 350℃.When the sintering temperature of metamorphic MgO is below 200℃,the strength of BMSC increases with the increase temperature;When the sintering temperature is between 200~350℃,the strength of BMSC decreases with the increase of temperature;When the temperature exceeds 350℃,the strength of BMSC increases with the increase of temperature.