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US 4,537,633 AGranted
Portland cement, process for preparing same, and compositions containing same
AssigneeSuh Kyung Suk
InventorWon P. Hong
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Abstract
An improved Portland cement composition and process for producing same comprising dry powder of Portland cement and very fine particles of carbon black, wherein the dry powder of Portland cement is coated with an asphalt film prior to the addition of the carbon black.
Claims18
A Portland cement composition comprising
- (1) dry powder of Portland cement, whose surface is coated with an asphalt film, and
- (2) particles of carbon black.
A method for preparing a Portland cement composition comprising the steps of:
- (a) adding molten or powdered asphalt to a dry powder of Portland cement;
- (b) heating and agitating the mixture of step (a) at 100.degree. to 150.degree. C.;
- (c) cooling the product of step (b) to room temperature;
- (d) admixing the resulting asphalt filmed Portland cement particles of step (c) with carbon black and agitating until a homogeneous mixture is produced.
1 more element
Dependencies are inferred from the claim text.