Pre-blend cement compositions containing non-chloride...

C - Chemistry – Metallurgy – 04 – B

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C04B 22/00 (2006.01)

Patent

CA 2588091

The present invention relates to pre-blend cement for general-purpose concrete construction containing Class-F fly ash, Class-C fly ash or slag, and less than about 5 percent (w/w) of sodium thiocyanate (NaSCN) and/or calcuim nitrate (Ca(NO3)2), as a substantial replacement for cement. The sodium thiocyanate and/or calcuim nitrate are additives for improved high early strength and accelerated setting times, thereby allowing the concrete structure to be put into service sooner, reducing labor cost, and allowing precast concrete masonry manufacturers to achieve rapid from and mold turnover.

La présente invention a pour objet un ciment prémélangé pour tous types de constructions en béton en remplacement d~un ciment classique. Ledit ciment contient des cendres volantes de Classe F, des cendres volantes de Classe C ou du mâchefer, et moins de 5 pourcent en masse environ de thiocyanate de sodium (NaSCN) et/ou de nitrate de calcium (Ca(NO3)2). Le thiocyanate de sodium et/ou le nitrate de calcium sont des additifs permettant d~améliorer la résistance initiale et d'accélérer le temps de prise, ce qui permet à la structure de béton d'être mise en service plus rapidement, réduisant ainsi le coût des travaux, et permettant aux fabricants d~éléments de maçonnerie prémoulés d~accélérer la vente et le réassort de leurs produits.

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