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对比研究了含与不含氧化硼对铝酸钙水泥水化行为的影响。通过测试水泥净浆的水化放热曲线,对比分析了铝酸钙水泥中的氧化硼杂质含量对水泥水化速率的影响,以及水泥水化时的电导率随养护时间的变化,阐述了该杂质对水泥溶解沉淀速率的影响。通过冷冻真空干燥的方法中止水泥水化,继而用X射线衍射和热重分析研究了上述两种水泥净浆的水化产物组成。用维卡仪测定了水泥砂浆的凝结时间,用跳桌法测定了水泥结合浇注料的流动值衰减。结果表明:铝酸钙水泥中的氧化硼杂质缩短了水泥的水化诱导期,加速了水泥水化形成大量沉淀的进程,从而促进了水泥的水化,缩短了砂浆的凝结时间,并加快了水泥结合浇注料的流动值衰减速度。
The effect of containing and not containing boron oxide on hydration of calcium aluminate cement was studied. By measuring the hydration exothermic curve of cement paste, the influence of boron oxide content in cement on the cement hydration rate and the change of conductivity with curing time were compared and analyzed. Impacts of Impurities on Cement Solubilization and Precipitation Rate. The cement hydration was stopped by freeze-drying in vacuo, and the hydration product composition of the two cement pastes was investigated by X-ray diffraction and thermogravimetric analysis. The setting time of cement mortar was measured by Vicat apparatus, and the flow value decay of cement-bonded castable was determined by the jump table method. The results show that the impurities of boron aluminate in calcium aluminate cement shorten the hydration induction period of cement and speed up the process of hydration of cement to form a large amount of precipitate, thereby promoting the hydration of cement, shortening the setting time of mortar and accelerating Cement bonded castable flow value decay rate.