Abstract

This paper reports upon the research into the influence of sodium ions on C12A7. The actual research work consisted in synthesizing C12A7, treated with the sodium ions as Na2CO3, within the sodium concentration range of up to 25% Na2O by weight in C12A7. The resultant combinations have been identified by the X-ray analysis, the infra-red spectroscopy and the quantitative chemical analysis.The identification procedure together with the analysis of free CaO content in the products of C12A7 sodium synthesis gave evidence that sodium which is introduced into the researched amount of C12A7 up to 10% Na2O by weight, contributes to the formation of the ever increasing phase of the solid solutions of Na2O in C3A. The continued increase of the sodium volume ( 15% Na2O by weight ) makes it resolve gradually into sodium aluminate β -NA and free CaO.

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