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Isomorphous Substitution of Aluminium for Silicon in Tobermoritic Structure. II. The Mixtures Prepared from Different Starting Materials and from Gels Containing Aluminium Ion

J. Petrovińć

Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava 9

 

Abstract:  The samples with the molar ratio C/(S + A) = 0.8* were prepared by hydrothermal synthesis at 180°C. The Si02 gels, containing from 4.32 —44.80% of Al203, as well as different forms of Si02 and Al203 [1] were applied as starting materials. The samples were studied by X-ray diffraction method, differential thermal analysis, infrared spectroscopy and electron microscopy. It was found that tobermorite was formed in the samples prepared from the gels containing up to 15% of Al203. The hydrogarnet arose when the aluminium content was higher. It was found that the entering of aluminium into tobermoritic structure advanced the transformation of C —S—H I into tobermorite. This substitution had also effect on the morphologie shapes of tobermoritic crystals.

Full paper in Portable Document Format: 237a507.pdf

 

Chemical Papers 23 (7) 507–514 (1969)

Tuesday, September 27, 2022

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