Abstract The hydration and strength evolution of two multi-phase ternesite-based cements with 15 and 29 wt% ternesite are reported. The synthesis and hydration properties of single phase ternesite, nominally Ca5(SiO4)2SO4, are also reported including both chemically-pure ternesite and preparations doped with sodium, potassium, phosphorous, magnesium, manganese, strontium, zinc and titanium oxides. Hydration of the samples at 25 °C was studied by calorimetry and quantitative X-ray diffraction. Unconfined compressive strength development was determined for up to 1 year. Single-phase chemically activated ternesite hydrated rapidly at 25 °C achieved compressive strengths of ≈30 and ≈65 MPa at 28 and 90 days respectively, with C-S-H and gypsum as hydration products. The multi-phase ternesite-based cements reached 7 day strengths of ≈30 MPa. It is concluded that ternesite reacts with water, exhibiting strength gain. The future of calcium sulfoaluminate and sulfosilicate cements is discussed and it is suggested that a considerable, and as yet unrealised scope exists for simultaneously optimising cementing properties while lowering production costs and reducing CO2 emissions.

中文翻译：

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白钨矿Ca 5 (SiO 4 ) 2 SO 4 的合成与水化

摘要 报道了两种具有 15 和 29 wt% 白钨矿的多相白钨矿基水泥的水化和强度演变。合成和水合性质的单相硫磷锰矿，名义上是 Ca5(SiO4)2SO4，包括化学纯的硫磷锌矿和掺杂钠、钾、磷、镁、锰、锶、锌和钛氧化物的制备物。通过量热法和定量 X 射线衍射研究了样品在 25°C 下的水合作用。无侧限抗压强度发展确定长达 1 年。在 25 °C 下快速水化的单相化学活化的白钨矿在 28 天和 90 天时分别达到 ≈30 和 65 MPa 的抗压强度，其中 CSH 和石膏作为水化产物。多相三沸石基水泥达到 ≈30 MPa 的 7 天强度。结论是白钨矿与水反应，表现出强度增加。讨论了硫铝酸钙和硫硅酸盐水泥的未来，并提出了一个相当大但尚未实现的范围，可以同时优化固井性能，同时降低生产成本和减少 CO2 排放。