Sulphate and aluminium play important roles in cement paste chemistry. They are closely linked through AFm, ettringite, and C-A-S-H. This study quantifies the distributions of sulphate and aluminium in cement pastes with limestone, fly ash, and a volcanic pozzolan, cured for 180 days at 20, 38, and 60 °C. Elevated temperatures convert carbonate AFm and ettringite to sulphate AFm and calcite. Only minor amounts of sulphate and aluminium are in the pore solution. SCMs increases the total aluminium content of the paste but do not increase greatly the amounts of aluminium present in AFm and ettringite. Instead, the additional aluminium is mainly incorporated in the C-A-S-H. C-A-S-H incorporates 25–55 % of sulphate and 20–40 % of aluminium in hydrated cement pastes. This is a significant portion that must be accounted for in thermodynamic models and mass balances.

中文翻译：

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硫酸盐和铝在水化水泥浆体中的分布

硫酸盐和铝在水泥浆化学中起着重要作用。它们通过 AFm、钙矾石和 CASH 紧密相连。这项研究量化了含有石灰石、粉煤灰和火山火山灰的水泥浆中硫酸盐和铝的分布，并在 20、38 和 60 °C 下固化 180 天。升高的温度将碳酸盐 AFm 和钙矾石转化为硫酸盐 AFm 和方解石。孔隙溶液中仅含有少量的硫酸盐和铝。 SCM 增加了浆料的总铝含量，但不会大幅增加 AFm 和钙矾石中存在的铝量。相反，额外的铝主要并入现金中。 CASH 在水合水泥浆中含有 25-55% 的硫酸盐和 20-40% 的铝。这是热力学模型和质量平衡中必须考虑的重要部分。