Patent ID: 8012543

Claim:
A method for reducing corrosion on steel reinforcement of steel-reinforced concrete constructions comprising applying a composition to a steel-reinforced concrete surface or steel-reinforcement, or adding the composition to fresh concrete, wherein the composition comprises at least one polyorganosiloxane S having at least 4 repeating units of the general formula (I) [A 1 z (B 1 O) p SiO (4-p-z)/2 ] (I) where B 1 is either H, an alkyl or aryl radical having up to 18 carbon atoms or a radical of the general formula (II) where X 1 and X 2 are each, independently of one another, O, S or NR 4 ; A 1 , R 2 , R 3 and R 4 are each, independently of one another, hydrogen or a hydrocarbon radical which contains up to 18 carbon atoms and may additionally contain heteroatoms selected from the group consisting of O, S, Si, Cl, F, Br, P and N; R 5 , R 5 ′ and R 6 are each, independently of one another, an unbranched or branched alkylene radical having from 1 to 8 carbon atoms; z and p are each, independently of one another, 0, 1, 2 or 3; m is 0 or an integer from 1 to 10; q is 0 or an integer from 1 to 10; with the proviso that at least one radical of the general formula (II) and at least one alkoxy or aryloxy radical having up to 18 carbon atoms and at least one repeating unit of the general formula (I) in which the silicon atom is bound to three oxygen atoms are present in the polyorganosiloxane S, wherein at least 70 mol % of the radicals B 1 in the polyorganosiloxane S are radicals of the general formula (II).