Cementitious compositions
AssigneeSterling Drug Inc.
InventorMiklos Szalavitz
Life of this patent
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Abstract
A method for preventing shrinkage of alkaline aqueous hydraulic cementitious mixtures during setting and hardening which comprises incorporating in the mixtures a monopersulfate salt, or a monopersulfate salt together with at least one peroxygen compound other than the monopersulfate salt; and hydraulic cement compositions for preparing such alkaline aqueous hydraulic cementitious mixtures. The monopersulfate salt, or monopersulfate salt together with at least one peroxygen compound other than monopersulfate salt, generates sufficient oxygen gas during setting and hardening of the alkaline aqueous hydraulic cementitious mixture to provide controlled expansion of the mixture.
Claims32
A hydraulic cement composition which on mixing with water forms an alkaline aqueous hydraulic cementitious mixture which has the property of setting into a hard mass the volume of which is at least as great as the original volume of the mixture, comprising in admixture a hydraulic cement mix and an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
A method for preventing shrinkage during setting and hardening of an alkaline aqueous hydraulic cementitious mixture obtained by mixing water with a hydraulic cement mix which comprises incorporating in said mixture an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
Dependencies are inferred from the claim text.