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Compressive strength of concrete and mortar containing fly ash

United States Patent

5,624,491
April 29, 1997
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. The invention includes a method for predicting the compressive strength of such a hardenable mixture, which is very important for planning a project. The invention also relates to hardenable mixtures comprising cement and fly ash which can achieve greater compressive strength than hardenable mixtures containing only concrete over the time period relevant for construction. In a specific embodiment, a formula is provided that accurately predicts compressive strength of concrete containing fly ash out to 180 days. In other specific examples, concrete and mortar containing about 15% to 25% fly ash as a replacement for cement, which are capable of meeting design specifications required for building and highway construction, are provided. Such materials can thus significantly reduce construction costs.
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/ 246,875
May 20, 1994
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.