Additive for hydraulic cement mixes
AssigneeSandoz Ltd.
InventorArthur H. Gerber
Life of this patent
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Abstract
A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to affect hydraulic setting of the cement, and an additive comprising an N-methylol amide, specifically, tri- or tetramethylolglycoluril alone or in combination with other accelerators of set. The additive is present in an amount sufficient to decrease the time necessary for the hardening of the concrete mix. Generally, the additive is present in a total amount of up to about 4.0% by weight based upon the weight of cement in the mix, usually in an amount of between about 0.01% and about 2.50% by weight of cement. The latter concentration is present when complex combinations of accelerators of set for hydraulic cement are employed.
Claims26
A hydraulic cement mix comprising portland cement, aggregate, sufficient water to effect hydraulic setting of the cement and a set accelerating effective amount of an admixture comprising a poly(N-methylol) derivative of glycoluril.
An admixture composition for accelerating the setting of hydraulic cement compositions comprising a poly(N-methylol) derivative of glycoluril and one or more materials selected from the group consisting of alkanolamines and inorganic salts of nitrates, nitrites, thiocyanates, chlorides and water soluble formates.
In the method of setting a hydraulic cement comprising the steps of:
- (a) bringing together in combination portland cement, aggregate, sufficient water to effect hydraulic setting of the portland cement and an admixture for accelerating the setting;
- (b) mixing the resulting combination to obtain a uniform, plastic mix;
- (c) applying the plastic mix to the desired form;
- and (d) allowing the plastic mix to set;
- the improvement comprising employing therein as such set accelerating admixture an admixture comprising a poly(N-methylol) derivative of glycoluril.
Dependencies are inferred from the claim text.