熟料中碱金属硫酸盐对水泥早期凝结的影响

发布时间：2018-05-01 01:33

本文选题：硫酸钠钾 + 硫酸钾　；参考：《硅酸盐学报》2017年05期

【摘要】：通过煅烧碱金属硫酸盐来模拟水泥熟料中的原生碱金属硫酸盐对水泥早期凝结行为的影响,根据ASTM C451水硬性水泥早凝测试方法研究不同碱金属硫酸盐对水泥早期凝结性能的影响,建立了不同硫酸钾、硫酸钠与石膏比例下水泥正常凝结、假凝和速凝的区域范围,并采用水化微量热仪、综合热分析仪和X射线衍射仪对水泥水化热及水化产物进行分析。结果表明:当硫酸钾或者硫酸钠含量高于总硫酸盐含量的75%以上时水泥会出现早凝,硫酸钾或硫酸钠钾会使水泥会发生假凝;硫酸钠会使水泥出现速凝,外掺更多石膏才能缓解这一不利影响。熟料中硫酸钾、硫酸钠钾会与石膏反应形成钾石膏引起假凝。可根据熟料中碱金属硫酸盐含量对水泥早期凝结行为进行预判,也可以通过调整碱金属硫酸盐和石膏的比例来调控水泥的早期凝结行为。
[Abstract]:The effect of primary alkali metal sulfate in cement clinker on the early setting behavior of cement was simulated by calcining alkali metal sulfate. According to ASTM C451 test method for early setting of hydraulic cement, the influence of different alkali metal sulfate on the early setting performance of cement was studied, and the range of normal setting, pseudo coagulation and quick setting of cement under different ratios of potassium sulfate, sodium sulfate and gypsum was established. The hydration heat and hydration products of cement were analyzed by hydration microcalorimeter, comprehensive thermal analyzer and X-ray diffractometer. The results show that when the content of potassium sulfate or sodium sulfate is more than 75% of the total sulfate content, the cement will have early solidification, potassium sulfate or sodium sulfate potassium sulfate will make the cement appear pseudo coagulation, sodium sulfate will make the cement quick solidify. It is only by adding more gypsum that this adverse effect can be mitigated. Potassium sulfate, sodium potassium sulfate and gypsum in clinker will react with gypsum to form potassium gypsum. The early setting behavior of cement can be predicted according to the content of alkali sulfate in clinker, or the early setting behavior of cement can be controlled by adjusting the ratio of alkali metal sulfate and gypsum.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：国家自然科学基金重点项目(51132010) 国家“十二五”科技支撑计划项目(2011BAA04B04)资助
【分类号】：TQ172.1

【相似文献】