Evaluation of P2O5 distribution inside the main clinker minerals by the application of EPMA method

The formation of Portland clinker phases has taken place in thermodynamically non-equilibrium state between macro-oxides CaO, SiO2, Al2O3, Fe2O3 and MgO from raw meal and P2O5 from bone meal. The paper deals with the study of clinker minerals as solid solutions with P2O5 during the clinkerization of raw mixture containing bone meal (BM). The ash of BM has contributed as a raw material to the formation of different clinker phases. Electron probe microanalysis (EPMA) method was used to determine the preferential distribution of P2O5 inside calcium silicate phases and its influence upon C2S/C3S ratio. Basing on these results, composition of solid solution of C2S and C3S was established.