Materiales de Construcción, Vol 45, No 237 (1995)

Research of the lime rich portions of the CaO-SiO2-P2O5 system


https://doi.org/10.3989/mc.1995.v45.i237.563

A. Diouri
Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences - Rabat, Morocco

A. Boukhari
Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences - Rabat, Morocco

J. Aride
Laboratoire de Physico-Chimie des Matériaux, E. N. S. Takaddoum - Rabat, Morocco

F. Puertas
Instituto Eduardo Torroja (CSIC), Spain

T. Vázquez
Instituto Eduardo Torroja (CSIC), Spain

Abstract


A detailed study has been carried out to explain the influence of Pp^ in silicate phases and in industrial raw meals upon their mineralogical compositions. Some compositions in the lime rich portion of the CaO-SiO2-P2O5 system are studied using laboratory reactants.

The results showed that the compositions lying in the range of CaO = 69,5-70,1; P2O5= 16,2-19,5; SiO2 = 11,1-13,6 (wt%) give, at 1000 °C, the mineralogical composition (HAp, β-C2S, C5PS) which can develop a high strength in chemically bonded ceramics. At high temperature (1400 ºC) these compositions give a large amount of silicocarnotite (C5PS) and 2C2.C3P phase.

A selected composition of the industrial raw meal with added phosphate: CaO = 62,66; SiO2 -= 17,33; Al2O3 = 4,88; Fe2O3 = 4,29; P2O5 = 8,73; MgO = 2,09 (wt%) forms at 1350 ºC a clinker containing high amount of α-C2S to replace C3S. Such a clinker may have good applications in the synthesis of active belite cement.

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