通过维卡仪、等温量热仪、X射线衍射仪、扫描电子显微镜等测试手段,研究了纳米TiO2对硫铝酸盐水泥凝结时间、早期水化过程和水化产物的影响.结果表明,加入纳米TiO2可以显著改善硫铝酸盐水泥早期凝结硬化过程,缩短水化诱导期,提前进入加速期和减速期,但是对稳定期的水化速率无明显影响.加入纳米TiO2影响了晶体的形成速率和结晶度,但是不改变水化过程的类型,加入纳米TiO2使水化产物结构密实,并导致其含量和微观结构发生一定程度的变化.
This paper studied the influence of nano-TiO2 on setting time, early hydration process and hydration products of sulfur aluminate cement (SAC) through Vicat apparatus, isothermal calorimetry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and so on.The results showed that nano-TiO2 could significantly improve the early setting and hardening process of SAC and reduce the time interval between the initial setting and the final setting, meaning that the hydration induction period was significantly shortened.The rapid acceleration reached in advance, but there was no significant effect on the rate of hydration heat during stable hydration period.Nano-TiO2 influenced the crystal formation rate and the degree of crystallinity, but it did not change the type of the hydration process.In addition, the structure of hydration products with nano-TiO2 was compact, and its content and microstructure changed to some degree.
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