Materiales de Construcción, Vol 39, No 214 (1989)

Manganese substitutions into the portland cement clinker phases


https://doi.org/10.3989/mc.1989.v39.i214.806

F. Puertas
ICCET/CSIC, Spain

M. Teresa Blanco
ICCET/CSIC, Spain

T. Vázquez
ICCET/CSIC, Spain

Abstract


The effect of manganese substitution into the crystal structures of the main Portland cement clinker phases (3CaO.SiO2, 2CaO.SiO2, 3CaO.Al2O3, 2CaO.Fe2O3 y 4CaO.Al2O3.Fe2O3) has been studied by X-ray and analytical electron microscopy.
In oxidizing conditions, the limit of solid solution in 3CaO.SiO2 is about 0.72 ±0.11% (wt), while in 2CaO.SiO2 is 1.53±0,12%(wt). Mn solid solubility on 3CaO.Al2O3structure, in oxidizing conditions is close to 0.78 ± 0,12% (wt). In identical atmosphere, the proportion of Mn in the ferrite phases (2CaO.Fe2O3 and 4CaO.Al2O3.Fe2O3) is 6.80 ± 0.87% (wt) and 6.7% (wt), respectively.
To each mentioned clinker phases a solid solution formula has been proposed. In these formula, the manganese substitutions and also the different oxidation states which this element can be introduced in those crystalline structure are defined.

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