Mitigating adverse effects of ettringite in mineral binder compositions

Abstract

A polymer is used for improving the effectiveness of a dispersant, in particular a polycarboxylate ether-based dispersant, in a mineral binder composition forming and/or including ettringite, and/or for reducing or inhibiting adverse effects of ettringite on the effectiveness of a dispersant in a mineral binder composition, the polymer including: a) at least one monomer unit M1 of formula I: CH2═CHNRCOR′  (I) whereby R and R independently of each other is a hydrogen atom or a methyl group, or where R and R′ together form an alkylene chain so as to provide, together with the N atom and the C atom to which they are attached, a cyclic structure, especially a five membered ring; b) optionally at least one further monomer unit M2.

Dependencies are inferred from the claim text.