Very high early strength cement
AssigneeUnited States Gypsum Company
InventorsRichard E. Galer, Paul C. Webb
Life of this patent
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Abstract
A combination of a hydroxy polycarboxylic acid and a starch hydrolyzate improves the compressive strength at early and late ages of a calcium sulfoaluminate cement.
Claims14
A hydraulic cement composition comprising from about 3.75% to about 40% of the compound 3CaO,3Al.sub.2 O.sub.3.CaSO.sub.4, from about 0.1% to about 5% of lime and from about 3% to about 35% of calcium sulfate, dicalcium silicate, from about 0.1% to about 2% hydroxy polycarboxylic acid, and from about 0.25% to about 4% of starch hydrolyzate solids from a hydrolyzate having a dextrose equivalent of from about 1 to 100, said amounts being based upon the total dry weight of said composition.
A method for preparing a cement composition comprising mixing from about 3.75% to about 40% of the ternary compound 3CaO.3Al.sub.2 O.sub.3.CaSO.sub.4, from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, from about 0.1% to about 2% of a hydroxy polycarboxylic acid, from about 0.25% to about 4% of starch hydrolyzate solids from a hydrolyzate having a dextrose equivalent of from about 1 to 100, and dicalcium silicate as the substantial remainder.
A method for increasing the compressive strength, upon full or partial hydration, of a hydraulic cement comprising from about 4% to about 40% of 3CaO.3Al.sub.2 O.sub.3.CaSO.sub.4, from about 0.1 to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of from about 0.1 to about 2% of a hydroxy polycarboxylic acid and from about 0.25% to about 2% of starch hydrolyzate solids from a hydrolyzate having a dextrose equivalent of from about 1 to 100, based on the total dry weight of said cement and said admixtures.
Dependencies are inferred from the claim text.