The hydration of calcium aluminates phases at low temperatures (5 °C, 10 °C, 15 °C)

conference paper

English

The paper is focused on the hydration of the calcium aluminate phases at low temperatures. Monocalcium aluminate (CA), monocalcium dialuminate (CA2), dodecacalcium heptaaluminte (C12A7) and tricalcium aluminate (C3A) were prepared by sintering stoichiometric ratios of CaCO3 and Al2O3 at high temperatures. The hydration was performed at three temperatures (5 °C, 10 °C and 15 °C) for 50 hours. The course of hydration was measured by isothermal calorimetry. The hydration products were characterized by X-ray diffraction (XRD) and combined differential thermal analysis - thermogravimetry (DTA-TG). The reactivity of phases decreased with higher content of alumina from C3A to CA2. The main hydration product of CA2 and CA was CAH10 at all temperatures. C3A and C12A7 created various hydration products, which depended on the temperature.

calcium aluminate phases, low temperatures, calorimetry

KOPLÍK, J.; NOVOTNÝ, R.; MÁSILKO, J.; ŠVEC, J.

16. 9. 2019

Research Institute of Binding Materials Prague

Prague

2523-935X

5th International Congress on the Chemistry of Cement (ICCC 2019) Congress proceedings – Papers and Posters Proceedings

Czech Republic

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