Gcp Applied Technologies Inc.

Keith St Jean

Lawrence L Kuo

Nathan A Tregger

Klaus-Alexander Rieder

Stephen Klaus

Yohannes K Lemma

Pierre Estephane

Danila F Ferraz

Stephen P Klaus

KlausAlexander Rieder

The present invention provides a composition and method for modifying a hydratable cementitious composition such as concrete or mortar using at least three different, distinct carboxylate polymers, even when clay is present in the concrete or mortar that would otherwise diminish dosage efficiency of polycarboxylate polymer used as dispersant. The three polycarboxylate polymers, designated as Polymer I, Polymer II, and Polymer II, are derived from monomer Components A, B, and C wherein Component A is an unsaturated carboxylic acid, Component B is a polyoxyalkylene, and Component C is an unsaturated carboxylate ester. The component molar ratio ranges for A:B:C are different as between Polymers I and II; while a distinct component molar ratio A:B+C is identified for Polymer III. When treated with these three different polycarboxylate polymers, the hydratable cementitious composition is surprisingly enhanced in terms of initial workability and slump retention, especially if clay is present.

Optimizing polycarboxylate admixtures for cementitious compositions

Superplasticizing admixture for cementitious compositions

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Leominster, MA, United States of America

Keith St Jean