为了研究葡萄糖酸钠对大掺量石灰石粉水泥浆体水化行为的影响,采用等温量热测试、X射线衍射测试、热重测试研究了胶凝材料体系的水化进程、水化产物种类与含量的变化;并采用相边界成核与生长模型探究了葡萄糖酸钠作用下大掺量石灰石粉水泥水化产物成核与生长机制。结果表明:葡萄糖酸钠能够延缓大掺量石灰石粉水泥的水化,减少水化产物的生成,从而降低其水化程度;另外,葡萄糖酸钠能够降低水化产物早期成核与生长的速率,减小水化产物早期在相边界成核与生长的面积。
Abstract
To investigate the impact of sodium gluconate on the hydration behavior of cement slurry containing high-volume limestone powder, we employed isothermal calorimetry, X-ray diffraction test, and thermogravimetric test to examine the hydration process and changes in types and content of hydration products in the cementitious material system. We also explored the mechanism of nucleation and growth of hydration products under the influence of sodium gluconate by using the phase boundary nucleation and growth model. Results demonstrate that sodium gluconate delays the hydration of cement containing high-volume limestone powder, leading to decreased generation of hydration products and a reduction in overall hydration degree. Moreover, sodium gluconate suppresses the rate of early nucleation and growth of hydration products, resulting in a decreased area of early nucleation and growth at phase boundary.
关键词
葡萄糖酸钠 /
大掺量石灰石粉 /
水化进程 /
水化产物 /
水化动力学
Key words
sodium gluconate /
large dosage limestone powder /
hydration process /
hydration product /
hydration kinetics
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基金
中央级公益性科研院所基本科研业务费项目(Y422007,Y420017,Y422001)
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