The hydration degrees of clinkers and ettringite stability in calcium sulfoaluminate (C S‾ A) cements in the presence of externally supplied dolomite were investigated in this study. The mineralogical and microstructural characteristics of C S‾ A cements containing different dosages of dolomite were characterized using X-ray diffractometry, Rietveld refinement-based quantification analysis, thermogravimetry analysis, mercury intrusion porosimetry, scanning electron microscopy observation, and energy dispersive spectroscopy point analysis. Furthermore, the binder systems were simulated using thermodynamic modeling to observe the phase changes of hydration products and the underlying hydration kinetics. The incorporation of dolomite accelerated clinker consumption and enhanced the stability of ettringite throughout the testing period, due possibly to the nucleation seeding effect and provision of carbonate ions by dolomite. The modeling outcomes showed the stability of ettringite at later stage by the incorporation of dolomite in the simulated timeframe, yet the active dissolution of dolomite assumed in the modeling procedure overestimated the Mg-bearing hydrates in the samples.

中文翻译：

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通过掺入白云石提高磺胺铝酸钙胶结剂的熟料水化程度和后期凝结石稳定性


本研究研究了在外部供应的白云石存在下磺铝酸钙 （C S ̅ A） 水泥中熟料的水化度和钙砾石稳定性。采用X射线衍射法、基于Rietveld精炼的定量分析、热重分析、汞侵入孔隙度法、扫描电镜观察和能量色散光谱点分析等方法对含不同白云石的C S ̅ A胶结剂的矿物学和微观结构特征进行了表征。此外，使用热力学建模对粘合剂系统进行模拟，以观察水合产物的相变和潜在的水化动力学。白云石的掺入加速了熟料的消耗，并在整个测试期间增强了钙砾石的稳定性，这可能是由于成核晶种效应和白云石提供碳酸根离子。建模结果表明，通过在模拟时间范围内掺入白云石，钙钠石在后期的稳定性，但建模过程中假设的白云石的主动溶解高估了样品中含镁的水合物。