mass modification composition suitable for mineral building materials

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The invention relates to a composition suitable for the mass hydrophobisation of inorganic building materials, in particular substantially non-siliceous inorganic building materials containing alkaline and/or earth alkaline metal, comprising at least one hydrocarbon-functionalised silane of formula I, the hydrolysate and/or condensate thereof and also an amine of formula II. The invention also relates to a method for preparing said composition and to the use of the composition for mass hydrophobisation, preferably of gypsum.