摘要:
The building compositions comprise hydrophobicizing powders which contain A) silica as support material and B) a hydrophobicizing component which is liquid at 10° C. and comprises B1) one or more organosilicon compound(s) and, if desired, B2) solvent and/or B3) water and emulsifier, with the proviso that the powders contain from 5 to 80% by weight of organosilicon compound, based on the total weight of the powder.