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研究了锂化合物对硫铝酸盐水泥凝结时间、水化历程、水化产物种类和形貌的影响。水化热试验表明:锂化合物的掺入使得硫铝酸盐水泥的水化诱导期消失,直接进入水化加速期,同时使得早期的水化速率和水化放热量显著增加,后期的水化放热量减小。X射线衍射分析表明:锂化合物的作用仅提高了水化产物的生成速率,对水化产物种类无影响。扫描电镜观察结果表明:锂化合物的掺入提高了水化产物的生成速率和生成量。研究结果还表明:空白硫铝酸盐水泥在水化加速期依次出现的3个水化放热峰是由于不同的钙钒石生成阶段所致;在相同的Li+掺量(以摩尔计)下,相对于Li2CO3而言,LiOH·H2O具有更强的加速硫铝酸盐水泥水化的能力。
The effects of lithium compounds on the setting time, hydration process, hydration product type and morphology of sulphoaluminate cement were studied. Hydration heat tests showed that the incorporation of lithium compounds led to the disappearance of hydration induction period for sulphoaluminate cement and directly entered the hydration acceleration period. At the same time, the early hydration rate and the hydration exotherm significantly increased, Heat dissipation is reduced. X-ray diffraction analysis showed that the effect of lithium compounds only increased the formation rate of hydration products and had no effect on the types of hydration products. Scanning electron microscopy showed that the incorporation of lithium compounds increased the formation rate and formation of hydration products. The results also show that the three hydration exothermic peaks of blank sulphoaluminate cement during the hydration accelerating period are due to different stages of the calcite formation. Under the same Li + content (on a molar basis) , Compared with Li2CO3, LiOH · H2O has a stronger ability to accelerate the sulphoaluminate cement hydration.