THE HYDRATION PRODUCTS OF A REFRACTORY CALCIUM ALUMINATE CEMENT AT INTERMEDIATE TEMPERATURES

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NILFOROUSHAN M.R.; TALEBIAN N.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Iranian Journal of Chemistry and Chemical Engineering Year:2007 | Volume:26 | Issue:3 Page(s): 19-24

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Title

THE HYDRATION PRODUCTS OF A REFRACTORY CALCIUM ALUMINATE CEMENT AT INTERMEDIATE TEMPERATURES

Author(s)

NILFOROUSHAN M.R. | TALEBIAN N. | Issue Writer Certificate

Keywords

CALCIUM ALUMINATE CEMENT (CAC)

HYDRATION REACTIONS

CA (CAAL2O4)

CA2 (CAO.2AL2O3)

CAH10 (CAO.AL2O3.10H2O)

C2AH8 (2CAO.AL2O3.8H2O)

C3AH6 (3CAO. AL2O3. 6H2O)

AH3 (AL2O3.3H2O)

Abstract

The major hydraulic phase in all the calcium aluminate cements including ciment fondue is CA (CaAl2O4). Once hydrated, it starts to form the hexagonal crystals of CAH10 and C2AH8 that depending on the time and temperature of hydration convert to the cubic crystals of C3AH6 and AH3. The nature, sequence, crystallinity and microstructure of hydrated phases of commercial refractory calcium aluminate cement were analyzed using differential scanning calorimetry (DSC), differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the formation of different hydrated phases was temperature dependent. At 28 oC, the hydration products at the beginning of hydration were a gel phase, C2AH8 and gibbsite, while CAH10 also formed after four days of hydration, both C2AH8 and CAH10 were converted to C3AH6 at latter ages. The rate of conversion of C2AH8 is dependent on the temperature and time of hydration at temperatures higher than 28 oC and accelerates with increasing temperature, but still takes several weeks for completion at 36 oC.

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