Quick-hardening hydraulic bonding agent
AssigneeHeidelberger Zement AG
InventorsJoachim Unsin, Hans Peter Braunbach, Manfred Tax
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Abstract
The present invention relates to a quick-hardening hydraulic bonding agent consisting of calcium silicate cement, particularly Portland cement, as well as additives and/or common admixtures which is characterized by a content of: 94.70 to 99.79% in weight of calcium silicate cement; 0.01 to 2.0% in weight of an organic and/or inorganic accelerator for the hydration of the calcium silicates; 0.1 to 3.0% in weight of an organic and/or inorganic retarding agent which inhibits the hydration of the calcium silicates, possibly having a liquefying effect; 0.01 to 0.30% in weight of an inhibiting agent with respect to the formation of the calcium aluminate sulfate hydrates.
Claims9
A quick-hardening hydraulic bonding agent consisting of Portland cement as well as additives, comprising:
- 94.70 to 99.79 weight % of Portland cement having a Blaine fineness between 2,500 and 20,000 cm.sup.2 /g,
- 0.1 to 2.0 weight % of an alkali carbonate,
- 0.1 to 3.0 weight % of at least one material selected from the group consisting of an alkali salt of lignosulfonic acid and an alkaline earth salt of lignosulfonic acid, and
- 0.01 to 0.30 weight % of at least one material selected from the group consisting of tartaric acid, citric acid, water-soluble salts of tartaric acid, water-soluble salts of citric acid, alkali salts of tartaric acid and alkali salts of citric acid,
- the bonding agent being produced without the addition of calcium aluminate, such that any calcium aluminate present in the bonding agent is derived from the Portland cement.
Dependencies are inferred from the claim text.