Abstract

It is known that 4CaO⋅Al2O3⋅Fe2O3 (C4AF) mineral gives high sulfate resistance to the cement hardening body in the portland cement. Crystalline C4AF was synthesized at 1300°C from the mixture of CaCO3, Al2O3 and Fe2O3 with a molar ratio of 4:1:1. Glassy C4AF was prepared by quenching the melt with water from 1450°C. Glassy C4AF becomes vitrified by the addition of 7 mass% of SiO2. Mossbauer spectrum showed that the iron in glassy C4AF was distorted. The fraction of the glass in C4AF increase with decreasing hydration speed. Because, C4AF glass formed strongly three-dimensional structure.

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