Summary
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1.
Solid solutions of calcium aluminoferrites are formed with the participation not of the cubic form of ScaO· 3Al2O3. but ofthombic (a′) form (which is structurally closer to 2C&0- Fe2O2 and to 4CaO·AI2O2· Fe2O2) the other components being dicalcium ferrite and a certain amount of free calcium oxide.
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2.
The compositions of the aluminoferrite containing the maximum amount of aluminate in solid solutions corresponds to 17.5% by weight of ferric oxide. The formula of such an aluminoferrite can be written 8CaO· 3AI2O3· Fe2O3.
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3.
4CaO· Al2O3· Fe2O3 does not form solid solutions containing 3C&0- Al2O3.
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4.
Aluminoferrites present in mixtures containing calcium aluminates, calcium silicates, or excess free calcium oxide are of variable composition.
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5.
The aluminoferrites of industrial clinkers are of variable composition.
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6.
Calculation of the mineralogical composition of clinker must take into account the formation of an aluminoferrite of the composition indicated by the results of microscopic investigation. This procedure increases the accuracy with which the contents of other clinker minerals can be calculated.
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