Cement grinding aid and set retarder
AssigneeWestvaco Corporation
InventorsHoward H. Moorer, Charles M. Anderegg
Life of this patent
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Abstract
Additives for use as grinding aids and set retarders in the manufacture of hydraulic cement composed of polyglycerol, preferably a polyglycerol selected from the group of di-, tri-, and tetraglycerol and mixtures thereof, the additive being used either alone or in combination with at least one of a water-soluble glycol, a water-soluble hydroxy-alkyl amine, a water-soluble salt of a sulfonated lignin and a water-soluble salt of an aliphatic acid having no more than three carbon atoms, the hydraulic cement product of this addition and the method for making the cement product.
Claims44
A hydraulic cement additive composition comprising a polyglycerol, from 10% to 50% by weight of the total additive composition of a water-soluble glycol, from 10% to 40% by weight of the total additive composition of a water-soluble salt of an aliphatic acid having no more than three carbons, from 10% to 50% by weight of a water-soluble hydroxyalkyl amine based on the combined weight of the glycol and the amine, and from 10% to 30% by weight of the total additive composition of a water-soluble salt of a sulfonated lignin.
A hydraulic cement composition containing as an essential ingredient from 0.01% to 0.5% based on the weight of the cement of an additive comprising a polyglycerol, from 0% to 90% by weight of the total additive being a water-soluble glycol, from 0% to 50% by weight of the total additive composition being a water-soluble salt of an aliphatic acid having no more than three carbons, from 0% to 75% by weight of a water-soluble hydroxy-alkyl amine based on the combined weight of the glycol and the amine, and from 0% to 50% by weight of the total additive composition of a water-soluble salt of a sulfonated lignin, wherein the polyglycerol comprises the additive in an amount equal to at least 0.01% based on the weight of the cement.
A process for increasing the grinding efficiency of a hydraulic cement and for retarding the set of the cement which comprises intergrinding with said cement from 0.01% to 0.5% by weight of the cement of an additive comprising a polyglycerol, from 0% to 90% by weight of the total additive composition of a water-soluble glycol, from 0% to 50% by weight of the total additive composition of a water-soluble salt of an aliphatic acid having no more than three carbons, from 0% to 75% by weight of a water-soluble hydroxy-alkyl amine based on the combined weight of the glycol and the amine, and from 0% to 50% by weight of the total additive composition of a water-soluble salt of a sulfonated lignin, wherein the polyglycerol comprises the additive in an amount equal to at least 0.01% based on the weight of the cement.
A concrete mix comprising a hydraulic cement and from 0.01% to 0.5%, based on the weight of the cement, of a polyglycerol.
A process for retarding the set of a hydraulic cement which comprises adding to a concrete mix of the cement from 0.01% to 0.5% of a polyglycerol, based on the weight of the cement.
Dependencies are inferred from the claim text.