Admixtures for reducing slump loss in hydraulic cement concretes专利检索-混凝土坍落度检验与质量控制专利检索查询-专利查询网

Admixtures for reducing slump loss in hydraulic cement concretes

阅读：264发布：2021-12-18

专利汇可以提供Admixtures for reducing slump loss in hydraulic cement concretes专利检索，专利查询，专利分析的服务。并且In freshly mixed portland cement concrete, slump loss, which normally occurs during transportation and handling, can be either prevented or considerably reduced by admixing small amounts of styrene-butadiene latices, e.g., 0.01 to 0.15% of latex (on solid basis) by weight of concrete or 0.1 to 1.5% of latex by weight of cement. Thus, by maintaining plasticity of fresh (unhardened) concrete for prolonged periods of time, the small amount of latex admixture can permit transportation of pre-mixed concrete over longer hauling distances, or permit longer handling time for placement, consolidation, and finishing of concrete in formwork.，下面是Admixtures for reducing slump loss in hydraulic cement concretes专利的具体信息内容。

权利要求

1. A COMPOSITION FOR REDUCING EARLY SLUMP LOSS IN HYDRAULIC CEMENT CONCRETES COMPRISING MIXTURE OF AN HYDRAULIC CEMENT, SAND, GRAVEL, WATER AND A STYRENE-BUTADIENE LATEX PRESENT, ON A SOLIDS BASIS, IN AN AMOUNT OF FROM ABOUT 0.1 TO ABOUT 1.5% BY WEIGHT OF THE CEMENT.

2. An hydraulic cement concrete mixture having reduced early slump loss including therein about 0.1 to about 1.5% by weight styrene-butadiene latex, on a solids basis, by weight of cement.

3. An hydraulic cement concrete mixture having reduced early slump loss at temperatures above 85*F including therein styrene-butadiene latex present, on a solids basis, in an amount from about 0.1 to about 1.5% by weight of the hydraulic cement, and a set retarder selected from the group consisting of citric acid and salts thereof, zinc oxide, ethylene glycol and glycerine.

4. A method for reducing early slump loss in hydraulic cement concretes comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of cement, into the concrete during the mixing thereof.

5. A method for reducing early slump loss in hydraulic cement concretes when mixed at temperatures greater than 85*F comprising admixing into the concrete styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of the hydraulic cement in said concrete, and further admixing into the concrete (in combination with) a set retarder.

6. The method of claim 5, wherein the set retarder is selected from the group consisting of citric acid and salts thereof, zinc oxide, ethylene glycol and glycerine.

7. A method of obtaining air entrained concrete having reduced slump loss tendencies, comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight relative to cement in said concrete, with concrete components of cement, sand, gravel and water during the mixing thereof.

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Admixtures for reducing slump loss in hydraulic cement concretes

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