Abstract This study focuses on the reaction of dolomite powder in combination with metakaolin in Portland composite cement pastes. We studied paste samples cured at 20 °C, 38 °C, and 60 °C for up to 1 year. In these systems, the only magnesium-containing hydration phase of dolomite observed was hydrotalcite. Dolomite reacted notably already after 90 days when cured at 60 °C, whereas at lower curing temperatures the reaction was limited. The increased availability of aluminium due to the addition of metakaolin did not contribute to the formation of hydrotalcite. The refined pore space due to the metakaolin addition did not inhibit the hydrotalcite formation. However, the almost total absence of portlandite due to the pozzolanic reaction of the metakaolin inhibited the dolomite reaction, even in pastes with high porosity. Portlandite seems to be the driving force for the reaction as its absence is inhibiting the reaction to take place.

中文翻译：

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含白云石和偏高岭土的波特兰复合水泥浆体中水滑石形成的局限性

摘要 本研究的重点是白云石粉与偏高岭土在波特兰复合水泥浆体中的反应。我们研究了在 20 °C、38 °C 和 60 °C 下固化长达 1 年的糊状样品。在这些系统中，观察到的白云石的唯一含镁水合相是水滑石。在 60 °C 下固化 90 天后，白云石已经发生了显着的反应，而在较低的固化温度下，反应受到限制。由于添加偏高岭土而增加的铝的可用性对水滑石的形成没有贡献。由于偏高岭土的加入而细化的孔隙空间并没有抑制水滑石的形成。然而，由于偏高岭土的火山灰反应，几乎完全没有硅酸盐抑制了白云石反应，即使在具有高孔隙率的糊状物中也是如此。