چكيده لاتين :
The major hydraulic phase in all the calcium aluminate cements including ciment
fondue is CA (CaAI20 4). Once hydrated, it starts to form the hexagonal crystals of CAH10 and
C2AHs that depending on the time and temperature of hydration convert to the cubic crystals of
C:;AH6 and AH1• The nature, sequence, crystallinity and microstructure of hydrated phases of
commercial refractory calcium aluminate cement were analyzed using differential scanning
calorimetry (DSC), d?fferential thermal analysis (DTA), X-ray diffraction (XRD) and scanning
electron microscopy (SEM). The results showed that the formation ofd~fferent hydrated phases was
temperature dependent. At 28°C, the hydration products at the beginning ofhydration were a gel
phase, C2AHsand gibbsite" while CAHlO also formed after four days ofhydration, both C2AHs and
CAH,o were converted to C.0H6 at latter ages. The rate ofconversion ojיC2AHs is dependent on the
temperature and time of hydration at temperatures higher than 28°C and accelerates with
increasing temperature, but still takes several week~for completion at 36°C.
