Ceramics-Silikáty 58 (2) 165-171 (2014)

ACTIVE BELITE β-C₂S AND THE HYDRATION OF CALCIUM SULFOALUMINATES PREPARED FROM NANO-MATERIALS

The aim of the present work is to study the effect of active belite on the hydration of C₄A₃S̅ and C₄AS̅. The results revealed that the active β-C₂S prevents the formation of crystalline ettringite and monosulfate hydrate as detected from the results of XRD. On the other side, the sulfoaluminate hydrates such as AFt and AFm were detected by using DSC technique. Gismondine C₄Al₈Si₈O₃₂·16H is formed from the reaction of β-C₂S or CSH with the liberated Al(OH)₃ from the hydration of C₄A₃S̅. This phase was not detected with the other monosulfate mix C₄AS̅. This is mainly due to the absence of AH₃ during the hydration of C₄AS̅. The results of XRD patterns are in good agreement with those obtained from DSC thermograms.

Keywords: Calcium sulfoaluminate C₄AS̅ , Belite β-C₂S, Hydration Products, Thermal Analysis, X-Ray Diffraction