Additive containing a superplasticizer and a copolymer

An admixture comprising:

• a) a superplasticizer and
• b) a copolymer having a polymer backbone and side chains bonded thereto, the copolymer comprising:
• at least one ionizable monomer unit M1 and
• at least one side chain-bearing monomer unit M2,
• wherein:
• the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone,
• the superplasticizer and the copolymer differ from a chemical and/or structural point of view, and
• the superplasticizer comprises the following substructure units:
• a) a molar parts of a substructure unit S1 of formula I
• b) b molar parts of a substructure unit S2 of formula II
• c) c molar parts of a substructure unit S3 of formula (III)
• d) d molar parts of a substructure unit S4 of formula (IV)
• where:
• L independently represents H+, an alkali metal ion, an alkaline earth metal ion, a di- or trivalent metal ion, an ammonium ion or an organic ammonium group,
• each Ru independently of any other is hydrogen or a methyl group,
• each Rv independently of any other is hydrogen or —COOM,
• r=0, 1, or 2,
• t=0 or 1,
• G1 and G2 are each independently a C1- to C20-alkyl group, -cycloalkyl group, -alkylaryl group, or -[A′O]s-G4, where A′=C2- to C4-alkylene, G4 is H, a C1- to C20-alkyl group, -cycloalkyl group, or -alkylaryl group, and s=2-250,
• G3 is independently —NH2, —NG5G6, or —OG7NG8G9,
• where:
• G5 and G6 are each independently
• a C1- to C20-alkyl group, -cycloalkyl group, -alkylaryl group, or -aryl group, or
• are a hydroxyalkyl group, an acetoxyethyl group (CH3—CO—O—CH2—CH2—), a hydroxyisopropyl group (HO—CH(CH3)—CH2), or an acetoxyisopropyl group (CH3—CO—O—CH(CH3)—CH2—);
• or
• G5 and G6 together form a ring, which includes the nitrogen, in order to form a morpholine or imidazoline ring;
• G7 is a C2-C4-alkylene group,
• G8 and G9 each independently represents a C1- to C20-alkyl group, -cycloalkyl group, -alkylaryl group, -aryl group, or a hydroxyalkyl group, and
• a, b, c and d represent molar proportions of the respective substructure units S1, S2, S3 and S4,
• a/b/c/d=(0.1-0.9)/(0.1-0.9)/(0-0.8)/(0-0.8), and
• with the proviso that a+b+c+d=1.