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The reactivities of hydratable alumina, calcium zirconium aluminate and their binary mixtures were investigated by calorimetric method, X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), differential thermal/thermogravimetric analysis (DTA–TG) and scanning electron microscope observations. The rate of heat evolution illustrates only one distinct exothermic peak in the mixtures containing calcium zirconium aluminate which corresponds the subsequent precipitation of hydrated material mainly in the form of amorphous CaO–AlO–HO phases and crystalline CAH occurs simultaneously after wetting of CaZrAlO grains. Nevertheless, coexistence of both unstable calcium aluminate hydrates (CAH, CAH, CAH) and thermodynamically more stable CAH detected by FT-IR and DTA–TG in the paste cured at 20 °C may have originated in the thermally induced partial conversion reaction due to the considerable amount of heat generated by the CaZrAlO hydration. It is also found that curing temperature affected the hydration products formed in the hydration products of both CaZrAlO and CaZrAlO/AlO blends. Reactive alumina influences the hydration behavior of CaZrAlO facilitating the nucleation and growth of hydration products, causes characteristic changes in the microstructure of hardened blended pastes and favors recrystallization of dehydrated calcium aluminates.

Study of the hydration of calcium zirconium aluminate (Ca7ZrAl6O18) blended with reactive alumina by calorimetry, thermogravimetry and other methods