AFm phase
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 3 CaO·(Al,Fe)2O3·CaSO4·nH2O.
They form inter alia when tricalcium aluminate
reacts with dissolved calcium sulfate
.
Mineral hydration
Mineral hydration is an inorganic chemical reaction where water is added to the crystal structure of a mineral, usually creating a new mineral, usually called a hydrate....
of hydraulic cements
Cement
In the most general sense of the word, a cement is a binder, a substance that sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed...
.
They are crystalline hydrates with general, simplified formula 3 CaO·(Al,Fe)2O3·CaSO4·nH2O.
They form inter alia when tricalcium aluminate
Tricalcium aluminate
Tricalcium aluminate Ca3Al2O6, often formulated as 3CaO·Al2O3 to highlight the proportions of the oxides from which it is made, is the most basic of the calcium aluminates...
reacts with dissolved calcium sulfate
Calcium sulfate
Calcium sulfate is a common laboratory and industrial chemical. In the form of γ-anhydrite , it is used as a desiccant. It is also used as a coagulant in products like tofu. In the natural state, unrefined calcium sulfate is a translucent, crystalline white rock...
.