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本文利用现场同步加速X-射线衍射、等温量热仪和膨胀测量等手段,研究了在20℃,100%相对湿度下,由25%(重量比)的铝酸钙水泥、12.5%的硅酸盐水泥、12.5%的β-半水石膏和50%的水组成的浆体的水化。水化伊始,首先形成了石膏和钙矾石,同时半水石膏也相应消耗(0-45min内)。随后石膏继续消耗,钙矾石持续形成,2h45min后石膏消耗完毕,铝酸盐-AFm开始形成,同时钙矾石的数量在7h内保持不变。热曲线的第一个峰源自机械搅拌、初始润湿和溶解,还有钙矾石和石膏的形成,第二个峰为石膏被钙矾石所替代,第三个对应于铝酸盐-AFm的形成。石膏被钙矾石替代伴随着0.7%平均线性膨胀。
In this paper, by means of field synchronous accelerated X-ray diffraction, isothermal calorimeter and swelling measurement, the effects of 25% (weight ratio) calcium aluminate cement, 12.5% silicic acid Salt cement, 12.5% β-hemihydrate gypsum and 50% water. At the beginning of hydration, gypsum and ettringite are formed first, and the hemihydrate gypsum is also consumed accordingly (within 0-45 minutes). Subsequently, gypsum continued to be consumed, ettringite continued to form, gypsum consumed after 2h45min, aluminate-AFm began to form, while the amount of ettringite remained unchanged within 7h. The first peak of the thermal curve results from mechanical agitation, initial wetting and dissolution, as well as the formation of ettringite and gypsum, the second peak being gypsum replaced with ettringite and the third corresponding to aluminate-AFm Formation. Gypsum is replaced by ettringite with an average linear expansion of 0.7%.