Early and late hydration of supersulphated cements of blast furnace slag with fluorgypsum

• Autores: M. E. Bazaldúa Medellín, A. F. Fuentes, A. Gorokhovsky, J.I. Escalante
• Localización: Materiales de construcción, ISSN 0465-2746, Vol. 65, Nº. 317, 2015
• Idioma: inglés
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• Resumen

  • The hydration, strength development and composition of hydration products of supersulphated cements were characterized from the first 48 hours up to 360 days. Two compositions of 80% Blast furnace slag, 10–15% Fluorgypsum and 10–5% Portland cement were cured in dry and wet conditions. The main hydration products were ettringite and C-S-H since the first hours and up to 360 days as evidenced by X-ray diffraction, thermal analysis and electron microscopy. The strength was favored by higher fluorgypsum contents and lower Portland cement contents. These cements generated heats of hydration of 40–57 KJ/Kg after 28 hours, which are lower than portland cement.