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

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.

[1]  C. Shi,et al.  New cements for the 21st century: The pursuit of an alternative to Portland cement , 2011 .

[2]  J. I. Escalante-García,et al.  Hydraulic binders of Fluorgypsum–Portland cement and blast furnace slag, stability and mechanical properties , 2010 .

[3]  J. I. Escalante-García,et al.  Hydration reactions and microstructural characteristics of hemihydrate with citric and malic acid , 2009 .

[4]  B. Lothenbach,et al.  Hydration mechanisms of super sulphated slag cement , 2008 .

[5]  T. Matschei,et al.  Hydration behaviour of sulphate-activated slag cements , 2005 .

[6]  J. Sharp,et al.  Variation in the Composition of C‐S‐H Gel in Portland Cement Pastes Cured at Various Temperatures , 2004 .

[7]  E. Gartner.  Industrially interesting approaches to “low-CO2” cements ☆ , 2004 .

[8]  J. I. Escalante-García,et al.  Hydration Products and Reactivity of Blast‐Furnace Slag Activated by Various Alkalis , 2003 .

[9]  John H. Sharp,et al.  The effect of temperature on the early hydration of Portland cement and blended cements , 2000 .

[10]  Caijun Shi,et al.  Some factors affecting early hydration of alkali-slag cements , 1996 .

[11]  P. Kapur,et al.  Plaster of Paris activated supersulfated slag cement , 1982 .

[12]  J. Bijen,et al.  Supersulphated cement from blastfurnace slag and chemical gypsum available in the Netherlands and neighbouring countries , 1981 .

[13]  Ciaran McNally,et al.  Development of calcium sulfate - ggbs - Portland cement binders , 2009 .

[14]  Sir Robert,et al.  The chemical composition and microstructure of hydration products in blended cements , 2004 .

[15]  I. Odler.  Special Inorganic Cements , 2000 .

[16]  Halis Ölmez,et al.  The mechanical properties of supersulphated cement containing phosphogypsum , 1993 .

[17]  H. Midgley,et al.  The micro structure of hydrated super sulphated cement , 1971 .