Abstract Understanding the sulfate balance mechanism of cement is needed for an effective use of sustainable blended cements. Pure phase systems allow to study the interaction between sulfate and each of the phases involved in early age hydration separately. This paper explores the effect of different factors on sulfate requirement in C3S/C3A systems. It was observed that reaction rates of both C3S and C3A have an influence on the overall sulfate balance, as they affect the amount of sulfate adsorbed on C-S-H and the amount of ettringite formed, respectively. Furthermore, the type of sulfate source used (gypsum or hemihydrate) can also significantly change the position of the aluminate peak for the same total sulfate in the system.

中文翻译：

---

影响纯相 C3S/C3A 系统中硫酸盐平衡的因素

摘要 要有效利用可持续混合水泥，需要了解水泥的硫酸盐平衡机制。纯相系统允许分别研究硫酸盐与早期水化中涉及的每个相之间的相互作用。本文探讨了不同因素对 C3S/C3A 系统中硫酸盐需求的影响。据观察，C3S 和 C3A 的反应速率对整体硫酸盐平衡都有影响，因为它们分别影响吸附在 CSH 上的硫酸盐量和形成的钙矾石量。此外，所用硫酸盐源的类型（石膏或半水合物）也可以显着改变系统中相同总硫酸盐的铝酸盐峰的位置。