Sulfate and acid resistant concrete and mortar

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 18/08 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2190742

The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction and other applications, which hardenable mixtures demonstrate significant levels of acid and sulfate resistance while maintaining acceptable compressive strength properties. The acid and sulfate hardenable mixtures of the invention containing fly ash comprise cementitious materials and a fine aggregate. The cementitious materials may comprise fly ash as well as cement. The fine aggregate may comprise fly ash as well as sand. The total amount of fly ash in the hardenable mixture ranges from about 60 % to about 120 % of the total amount of cement, by weight, whether the fly ash is included as a cementitious material, fine aggregate, or an additive, or any combination of the foregoing. In specific examples, mortar containing 50 % fly ash and 50 % cement in cementitious materials demonstrated superior properties of corrosion resistance.

Cette invention se rapporte à du béton, du mortier et d'autres mélanges durcissables, renfermant du ciment et des cendres volantes, conçus pour être utilisés dans la construction et dans d'autres applications, ces mélanges durcissables possédant des niveaux importants de résistance aux acides et aux sulfates, tout en conservant des propriétés de résistance à la compression acceptables. Ces mélanges durcissables en présence d'acides et de sulfates, qui contiennent des cendres volantes, comprennent des liants hydrauliques et des gravillons fins. Ces liants hydrauliques peuvent contenir des cendres volantes ainsi que du ciment. Les gravillons fins peuvent comporter des cendres volantes ainsi que du sable. La quantité totale de cendres volantes dans le mélange durcissable est comprise entre environ 60 % et environ 120 % de la quantité totale de ciment en poids, que ces cendres volantes soient incluses comme liant hydraulique, comme gravillons fins ou comme additif ou comme combinaison de n'importe lesquels de ces éléments. Dans des exemples spécifiques, du mortier contenant 50 % de cendres volantes et 50 % de ciment dans un liant hydraulique a démontré des propriétés supérieures de résistance à la corrosion.

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