Mineral building materials with additives

Mineral building materials which contain inorganic binders, optionally aggregates and at least one additive, wherein the additives used are condensation products of a) substituted or unsubstituted diphenyl sulphones, b) formaldehyde and c) compounds from the group consisting of mononuclear or polynuclear, substituted or unsubstituted aromatic compounds, acid amides, urea, urea derivatives, substituted or unsubstituted aromatic ethers and amines, further wherein the components a) and c) are used in a molar ratio of 1:5 to 5:1, with formaldehyde in a molar ratio of 1:0.8 to 1:2, based on the component a or c) that is present in the larger molar amount.