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

• Main Authors: M. E. Bazaldúa-Medellín, A. F. Fuentes, A. Gorokhovsky, J. I. Escalante-García
• Format: Article
• Language: English
• Published: Consejo Superior de Investigaciones Científicas 2015-03-01
• Series: Materiales de Construccion
• Subjects: supersulphated; c-s-h; ettringite; hydration; microstructures
• Online Access: http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1685
• ISSN: 0465-2746; 1988-3226

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.