Chloride-free setting accelerator for hydraulic binding agents
AssigneeSika AG, vorm. Kaspar Winkler & Co.
InventorsTheodor Burge, Eugen Bodenmann
Life of this patent
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Abstract
For the acceleration of the setting and of the hardening of a hydraulic binding agent such as cement, limestone, hydraulic limestone and gypsum as well as mortar and concrete prepared thereof, are added to the mixture, which contains said binding agent, from 0.5 to 10 percent by weight, referred to the weight of this binding agent, of an alkali-free setting- and hardening-accelerator, whereby this accelerator contains aluminum hydroxide.
Claims6
A process for the acceleration of the setting and of the hardening of a hydraulic binding agent, such as cement, limestone, hydraulic limestone and gypsum as well as mortar and concrete prepared thereof, characterized in that there are added to the mixture containing said binding agent, from 0.5 to 10 percent by weight of said binding agent, of (an alkali metal ion-free and) a chloride-free setting- and hardening-accelerator, wherein said accelerator contains at least 10% by weight of powdered aluminum hydroxide,
- at least some to 90% by weight of at least one
- water soluble sulfate, nitrate or formate salt of calcium, magnesium, iron or aluminum, and
- at least some to 30% by weight of at least one swellable
- polymer selected from the group consisting of methyl-, hydroxyethyl-, hydroxypropyl-, hydroxybutyl, hydroxyethylmethyl-, hydroxypropylmethyl-, and hydroxybutylmethyl-cellulose, the sum of these accelerator ingredients totaling 100%.
A chloride-free setting- and hardening-accelerator, wherein said accelerator contains at least 10% by weight of powdered aluminum hydroxide,
- at least some to 90% by weight of at least one water soluble sulfate, nitrate or formate salt of calcium, magnesium, iron and aluminum, and
- at least some to 30% by weight of at least one swellable polymer selected from the group consisting of methyl-, hydroxyethyl-, hydroxypropyl-, hydroxybutyl-, hydroxyethylmethyl-, hydroxypropylmethyl-, and hydroxybutylmethyl-cellulose, the sum of these accelerator ingredients totaling 100%.
Dependencies are inferred from the claim text.