Set-accelerating admixture having improved stability
AssigneeChryso
InventorsBruno Pellerin, David Babayan, Frédéric Rudolph
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Abstract
The present invention is mainly aimed at a set-accelerating admixture for hydraulic compositions comprising, in an aqueous solution, the reaction product of an alkanolamine with a concentrated strong acid; sulfate anions; and alkali or alkaline earth cations; having a pH comprised between 5 and 12. Moreover it is directed to a method for its preparation as well as to a method for preparing hydraulic compositions comprising the step for adding such an admixture to the hydraulic binder, before, during or after the grinding.
Claims15
A set-accelerating admixture for hydraulic compositions comprising, in an aqueous solution:
- the reaction product of an alkanolamine with a concentrated strong acid;
- sulfate anions;
- and
- alkali or alkaline earth cations;
- having a pH comprised between 5 and 12.
A method for preparing a set-accelerating admixture for hydraulic compositions comprising the steps:
- (1) adding a concentrated strong acid to an aqueous solution of alkanolamine;
- (2) adding to the product obtained in step (1) an aqueous solution of an alkali metal or alkaline earth metal chloride and/or sulfate;
- and
- (3) adjusting the pH to a value from 5 to 12 , before or after step (2).
Dependencies are inferred from the claim text.