Materiales de Construcción, Vol 65, No 317 (2015)

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


https://doi.org/10.3989/mc.2015.06013

M. E. Bazaldúa-Medellín
Cinvestav Unidad Saltillo, Mexico

A. F. Fuentes
Cinvestav Unidad Saltillo, Mexico

A. Gorokhovsky
Saratov State Technical University, Russian Federation

J. I. Escalante-García
Cinvestav Unidad Saltillo, Mexico

Abstract


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.

Keywords


Supersulphated; C-S-H; Ettringite; hydration; microstructures

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