AFm phase

From Wikipedia, the free encyclopedia

An AFm phase is an "alumina, ferric oxide, monosulfate" phase. AFm phases are important in the hydration of hydraulic cements.

They are crystalline hydrates with general, simplified formula 3CaO.(Al,Fe)₂O₃.CaSO₄.nH₂O They form inter alia when tricalcium aluminate reacts with dissolved calcium sulfate.