Kit of parts suitable to form a waterproofing membrane

Process for the waterproofing of porous construction materials, the process comprising the steps of

• providing a first component A and a second component B, the first component
• A comprising or consisting of
• a) 5-60 mass parts of a hydraulic binder,
• b) 0.5-15 mass parts of at least one synthetic polymer,
• c) 20-80 mass parts of aggregates, and
• d) optionally further additives
• and the second component B comprising or consisting of an aqueous emulsion
• of bitumen,
• mixing the first component A and the second component B,
• applying the mixture thus obtained to a porous construction material, and
• optionally hardening the applied mixture.