TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The alkoxy groups containing siloxane and optionally crosslinkable polydiorganosiloxane are free of oxime groups. The alkoxy groups containing siloxane is obtained from partial hydrolysis and condensation of at least one alkoxysilanes of formula (RqSiX4q) (II). The alkoxy groups-containing siloxane is present in an amount of 0.1-20 wt.%, preferably 0.1-10 wt.%. The cross-linkable polydiorganosiloxane comprises hydroxy groups or masked hydroxy groups, preferably alkoxy or acetoxy groups which are bonded to silicon atom and are preferably arranged terminally. The polydiorganosiloxane is a linear polydimethylsiloxane of formula (R4)3p-Si(R3)p-O-(Si(R1)(R2)-O)m-Si(R3)p-(R4)3-p). The polydiorganosiloxane is a hydroxy-terminated, alkoxy-terminated or acetoxy-terminated polydiorganosiloxane, preferably an alkoxy-terminated polydimethylsiloxane which exhibits a viscosity of 10-500000 mPax s, preferably 5000-400000 mPax s at a temperature of 23 degrees C. The component (b) comprises at least 15 wt.%, preferably at least 20 wt.% water. The component (b) is an aqueous dispersion. The component (b) comprises at least one additive comprising emulsifier, a thickener, a filler or at least one carrier material comprising polydiorganosiloxane or a plasticizer. The substrates to be bonded or grouted are made from the same or a different material, where the material comprises glass, metal, concrete, mortar, building block, asphalt, bitumen, plastics material or a composite material.R = non-hydrolysable monovalent hydrocarbon which optionally has at least one functional group, preferably methyl, n-propyl, vinyl, phenyl, 2-aminoethyl, 3-aminopropyl, 3-glycidoxypropyl or 3-mercaptopropyl;X = alkoxy, preferably 1-6C alkoxy, preferably methoxy, ethoxy or propoxy;q = 0-3 or 0 or 1;R1, R2, R3 = optionally branched monovalent 1-12C hydrocarbon optionally containing at least one heteroatoms, optionally at least one carbon-carbon multiple bonds and/or optionally cycloaliphatic and/or aromatic parts;R4 = OH or blocked OH, preferably alkoxy (preferred) or acetoxy;p = 0, 1 or 2; andm = integer selected such that the polydiorganosiloxane at a temperature of 23 degrees C has a viscosity of 10-500000 mPax s. EXAMPLE - Typical two-component composition comprised of component (a) comprised of 35.5 wt.% alpha , beta -bis(dimethoxymethylsilyl)-poly(dimethylsiloxane), 5.1 wt.% alpha , beta -bis(trimethylsilyl)-poly(dimethylsiloxane), 48.6 wt.% chalk, 2.5 wt.% silica, 1.3 wt.% carbon black, 2 wt.% ethylene oxide-propylene oxide-block copolymer with 40% ethylene oxide, 4.8 wt.% Dynasylan 6490 (RTM: Vinyl- and methoxy group containing oligomeric silane), 0.2 wt.% reaction product of dibutyl tin oxide and tetraethoxysilane and component (b) comprised of 4 wt.% PowerCure(RTM: Accelerator).