This study investigated the influence of different cooling regimes on the microstructure and consequent reactivity of belite-sulfoaluminate clinkers. The cement clinkers were synthesized by incorporating secondary raw materials, such as titanogypsum and bottom ash, to the natural raw materials. Clinker phases were determined by Rietveld quantitative phase analysis, while the distribution morphology and the incorporation of substitute ions in the phases were characterized by scanning electron microscopy using energy-dispersive X-ray spectroscopy (SEM/EDS). Clinker reactivity was studied using isothermal calorimetry and was additionally investigated through compressive strength, which was determined for the cement prepared from the synthesized clinkers. X-ray diffraction analysis showed that, as well as the three main phases (belite, calcium sulfoaluminate, and ferrite), the clinkers contained additional minor phases (mayenite, gehlenite, arkanite, periclase, and perovskite), the ratios of which varied according to the cooling regime utilized. Microscopic observations indicated that the cooling regime also influenced the crystal size and morphology of the main phases, which consequently affected clinker reactivity. Furthermore, a smaller amount of substitute elements was incorporated in the main phases when cooling was slowed. Results showed that, in comparison to clinkers cooled at slower rates, air quenched clinkers reacted faster and exhibited a higher compressive strength at 7 days.

中文翻译：

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冷却方式对贝利特-硫铝酸盐熟料的矿物学和反应性的影响

这项研究调查了不同的冷却方式对贝利特-硫铝酸盐熟料的微观结构和随之而来的反应性的影响。水泥熟料是通过在天然原料中掺入诸如钛石膏和底灰等次要原料而合成的。熟料相通过Rietveld定量相分析确定，而相的分布形态和取代离子的掺入通过使用能量色散X射线光谱（SEM / EDS）的扫描电子显微镜进行表征。使用等温量热法研究了熟料的反应性，并另外通过抗压强度进行了研究，这是由合成熟料制备的水泥的抗压强度。X射线衍射分析表明，以及三个主要相（贝利特，硫铝铝酸钙和铁素体），熟料还包含其他次要相（钙铝石，方铅矿，ar石，钙镁石和钙钛矿），其比例根据所采用的冷却方式而变化。显微镜观察表明，冷却方式也影响了主要相的晶体尺寸和形态，从而影响了熟料的反应性。此外，当冷却变慢时，在主要相中掺入了较少量的替代元素。结果表明，与以较低速率冷却的熟料相比，空气淬火熟料反应更快，并且在7天时表现出更高的抗压强度。其比率根据所使用的冷却方式而变化。显微镜观察表明，冷却方式也影响了主要相的晶体尺寸和形态，从而影响了熟料的反应性。此外，当冷却变慢时，在主要相中掺入了较少量的替代元素。结果表明，与以较低速率冷却的熟料相比，空气淬火熟料反应更快，并在7天时表现出较高的抗压强度。其比率根据所使用的冷却方式而变化。显微镜观察表明，冷却方式也影响了主要相的晶体尺寸和形态，从而影响了熟料的反应性。此外，当冷却变慢时，在主要相中掺入了较少量的替代元素。结果表明，与以较低速率冷却的熟料相比，空气淬火熟料反应更快，并且在7天时表现出更高的抗压强度。