Method for Controlling Clay Impurities in Construction Aggregates and Cementitious Compositions
AssigneeGCP Applied Technologies Inc.
InventorsLukasz DEBNY, Lawrence L. Kuo, Shuqiang Zhang, Arthur Kyriazis
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Abstract
The present invention provides a method for treating clay-bearing aggregates, particularly those used for construction purposes, which involve introducing to clay-bearing aggregates an ion-exchanged polycondensate of dialkylamine and epichlorohydrin having anionic groups comprising both acetate and chloride ionic groups, wherein the acetate is present in an amount of 51-99 percent, and more preferably in the amount of 60-95 percent, based on molar concentration of the anionic groups, whereby chloride ionic groups are minimally present.
Claims14
A method for controlling clay impurities in construction aggregates, comprising:
- combining, with a plurality of clay-bearing aggregates, an ion-exchanged polycondensate of dialkylamine and epichlorohydrin as represented by structural formula [I],
- wherein R1 and R2 each independently represent C1 to C3 alkyl groups;
- and A− represents anionic groups comprising both acetate and chloride ionic groups wherein the amount of acetate is 51-99 percent based on molar concentration of the anionic groups represented by A−;
- and
- further wherein A− comprises a chloride ionic group in the amount of 1-49 percent based on molar concentration of the anionic groups represented by A−.
An admixture composition comprising:
- (A) an ion-exchanged polycondensate of dialkylamine and epichlorohydrin as represented by structural formula [I],
- wherein R1 and R2 each independently represent C1 to C3 alkyl groups;
- and A− represents anionic groups comprising both acetate and chloride ionic groups wherein the amount of acetate is 51-99 percent based on molar concentration of the anionic groups represented by A−;
- and further wherein A− comprises a chloride ionic group in the amount of 1-49 percent based on molar concentration of the anionic groups represented by A−;
- and
- (B) at least one water-reducing agent for plasticizing cement, mortar, or concrete.
Dependencies are inferred from the claim text.