Use as an agent improving the workability of an aqueous formulation with a hydraulic binder base, of a (meth)acrylic comb-branched copolymer and an associative acrylic thickener

A method of forming an aqueous formulation comprising a hydraulic binder base having improved workability, the method comprising mixing a combination with said hydraulic binder base,

• wherein the combination comprises:
• A) an aqueous solution comprising water and a comb-branched (meth)acrylic copolymer that comprises, expressed as a percentage by weight of each of its monomers:
• a1) 5% to 30% of (meth)acrylic acid,
• a2) 70% to 95% of at least one monomer of formula (I):
• wherein:
• m, n, p, and q are whole numbers and m, n, and p are less than 150, q is greater than 0, and at least one whole numbers among m, n, and p is nonzero;
• R is a radical comprising a polymerizable unsaturated function;
• R1 and R2 are identical or different, and represent a hydrogen atom or an alkyl group,
• R′ represents hydrogen, or a hydrocarbonated radical having 1 to 40 carbon atoms, or an ionic or ionizable group;
• and
• a3) 0% to 50% of at least one monomer different from monomers a1) and a2), wherein a sum of percentages of a1), a2), and a3) equals 100%;
• and
• B) an aqueous solution comprising water and an ASE acrylic polymer consisting of 55 wt. % methacrylic acid and 45% wt. % ethyl acrylate.