Aqueous suspensions of a silicate capable of binding calcium ions, containing, based on the total weight of the suspension, a) as silicate, a compound corresponding to Formula I: (Cat2/nO)x*Me2O3*(SiO2)y(I) and B) as dispersing component, a mixture of at least two oxoalcohol ethoxylates corresponding to Formula II R-(OCH2CH2)n-OH(II), wherein R=C10-C15 alkyl having a degree of branching of 0 to 90% linear and 100 to 10% single methyl branches n=3-5.25 mol ethoxy groups in Component 1 n=5.5-7.0 mol ethoxy groups in Component 2 C) a polyethylene glycol having an average molecular weight of from 200 to 2000.