TY - JOUR AU - Puertas, F. AU - Blanco, M. Teresa AU - Vázquez, T. PY - 1989/06/30 Y2 - 2024/03/29 TI - Manganese substitutions into the portland cement clinker phases JF - Materiales de Construcción JA - Mater. constr. VL - 39 IS - 214 SE - Research Articles DO - 10.3989/mc.1989.v39.i214.806 UR - https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/806 SP - 19-30 AB - The effect of manganese substitution into the crystal structures of the main Portland cement clinker phases (3CaO.SiO<sub>2</sub>, 2CaO.SiO<sub>2</sub>, 3CaO.Al<sub>2</sub>O<sub>3</sub>, 2CaO.Fe<sub>2</sub>O<sub>3</sub> y 4CaO.Al<sub>2</sub>O<sub>3</sub>.Fe<sub>2</sub>O<sub>3</sub>) has been studied by X-ray and analytical electron microscopy. In oxidizing conditions, the limit of solid solution in 3CaO.SiO<sub>2</sub> is about 0.72 ±0.11% (wt), while in 2CaO.SiO<sub>2</sub> is 1.53±0,12%(wt). Mn solid solubility on 3CaO.Al<sub>2</sub>O<sub>3</sub>structure, in oxidizing conditions is close to 0.78 ± 0,12% (wt). In identical atmosphere, the proportion of Mn in the ferrite phases (2CaO.Fe<sub>2</sub>O<sub>3</sub> and 4CaO.Al<sub>2</sub>O<sub>3</sub>.Fe<sub>2</sub>O<sub>3</sub>) 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. ER -