以硫硅酸钙为主导矿物的硫硅酸钙-硫铝酸钙水泥熟料，碳排放量比硅酸盐水泥熟料低45-50%，原料来源广，且硫硅酸钙活性可被硫铝酸钙水化产生的铝胶激发，有望具备良好的力学性能，具有规模化应用前景。但硫铝酸钙和硫硅酸钙的大量形成温度不一致，难以共存，且硫硅酸钙的水化程度和早期水化速率分别受铝胶/硫硅酸钙比和水化液相硫酸根浓度的制约。项目拟探讨微量元素对硫铝酸钙大量形成温度及硫硅酸钙分解温度的协同调控机制，实现其在同一温度范围共存；探讨硫铝酸钙/硫硅酸钙比对硫硅酸钙水化程度的调控机制，获得硫铝酸钙/硫硅酸钙比的关键范围，使铝胶满足硫硅酸钙充分水化的需求，优化水泥长期力学性能；探讨石膏与硫铝酸钙的匹配及石膏种类对水化液相硫酸根浓度和硫硅酸钙溶解的影响规律，揭示其对硫硅酸钙早期水化速率的调控机制，提高其早期水化速率，优化水泥早期力学性能。研究成果将为开发以硫硅酸钙为主导矿物的低碳新型水泥提供理论支撑。

The CO2 emission of ternesite-ye'elimite cement clinker, ternesite as the dominant mineral, is 45-50% lower than that of Portland cement clinker. The source of the material is wide. Besides, the hydration activity of ternsite can be activated by alumina gel generated by the hydration of ye'elimite, which makes it promising to possess good mechanical property. Therefore, it is quite possible for the wide application of the cement. However, the mass formation temperature ranges for ternesite and ye'elimite are different, which makes it difficult to coexist. In addition, the hydration degree and the early hydration rate of ternsite in the cement are restricted by the ratio of alumina gel/ternsite and the concentration of sulfate ion in the hydrated liquid phase, respectively. In this project, the synergistic regulation mechanism of trace elements on the mass formation temperature of ye'elimite and the decomposition temperature of ternesite will be studied, which will contribute to the coexistence of the two minerals. The regulatory mechanism of ye'elimite/ternsite ratio on the hydration degree of ternsite will be explored. The key ratio of ye'elimite/ternsite is obtained to make the amount of alumina gel meet the demand of full hydration of ternsite, which contributes to the improvement of cement long-term strength. The influence of gypsum/ye'elimite ratio and gypsum type on the sulfate ion concentration of the hydrated liquid phase and the dissolution of ternesite will be studied. The regulatory mechanism of gypsum/ye'elimite ratio and gypsum type on the early age hydration rate of ternesite will be explored. It contributes to the improvement of the early age hydration rate of ternesite and the the early age strength of the cement. The results will provide theoretical supports for the development of new type low-carbon cement with ternesite as the dominant mineral.