AFm phase

An AFm phase is an "alumina, ferric oxide, monosulfate" phase, or aluminate ferrite monosulfate, or Al₂O₃, Fe₂O₃ mono, in cement chemist notation. AFm phases are important in the hydration of hydraulic cements.
They are crystalline hydrates with general, simplified formula 3 CaO·₂O₃·CaSO₄·nH₂O.

They form inter alia when tricalcium aluminate reacts with dissolved calcium sulfate.

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