[EN]The effect of simultaneous addition of varying concentrations of manganese and phosphorus oxides on a C/S ≈ 3 composition has been investigated. Mineralogical changes on synthesized powders were identified by X-ray diffraction, Infra-red spectroscopy and DTA. M3 polymorph's alite formation with Mn and P inclusions less than 0.69 (wt%) Mn2O3 and 0.62 (wt%) P2O5 is shown. The Electron Paramagnetic Resonance investigations of synthesized monoclinic C3S show that Mn ions are in octahedral site as Mn2+ oxidation state. The formed solid solutions could be described with the following cationic vacancies formula: (Ca3−5X Mn4XX)(Si1−2X p2x) O5, with X ≤ 0.005.

Peer reviewed