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Sulfate and acid resistant concrete and mortar

United States Patent

5,772,752
June 30, 1998
View the Complete Patent at the US Patent & Trademark Office
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 cementitous 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 cementious 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.
Liskowitz; John W. (Belle Mead, NJ), Wecharatana; Methi (Parsippany, NJ), Jaturapitakkul; Chai (Bangkok, TH), Cerkanowicz, deceased; Anthony E. (late of Livingston, NJ)
New Jersey Institute of Technology (Newark, NJ)
08/ 737,665
November 20, 1996
The research leading to the present invention was conducted with Government support under Contract No. DE-FG22-90PC90299 awarded by the Department of Energy. The Government has certain rights in this invention.