Cement composition
AssigneeGeneral Portland, Inc.
InventorsWilliam Eugene Alderete, John Parke Boyer, Kenneth Earl Daugherty, David Lee Johnson
Life of this patent
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Abstract
A cement of the same general characteristics of a normal Type I is provided which involves the intergrind of from 1 up to about 25 parts by weight of air-cooled iron blast furnace slag, and from over 75 up to 99 parts by weight of conventional Type I Portland clinker. Traditional set control additives, particularly such as sulfate provided through gypsum, are used in the new cement composition. It is particularly noted that the slag involved is air-cooled, as contrasted to an amorphous material obtained by water quenching. In some respects the new product is better than traditional Type I, and can thus be referred to as an improved Type I.
Claims13
An efficacious cement consisting essentially of the grind obtained from the mixture of 1 up to 25 parts by weight of air-cooled iron blast furnace slag, and
- from over 75 up to 99 parts by weight of conventional Type I Portland clinker, and
- from 2 to about 10 parts by weight of set control additive.
The method of making an improved Type I cement comprising intergrinding an efficacious air-cooled slag of a substantially crystalline structure in quantity from 1 to 25 parts by weight with a Type I clinker in quantity of over 75 up to 99 parts by weight.
Dependencies are inferred from the claim text.