| abstract |
The mass for fastening dowels, threaded rods and the like in cavities, in particular boreholes, in concrete, stone and brick masonry, based on water glass, with at least one fine-grained, highly active reactant, such as SiO₂ and / or Al₂O₃, in particular from waste materials, and with Fillers, such as quartz powder and / or quartz sand, are characterized in that the water glass, in particular potassium water glass, has a molar ratio of SiO₂ to alkali oxide of> 1.4, preferably 1.45 - 1.60, but in any case <2, and that the mass also, based on 100 parts by weight of water glass, contains 10-40, preferably 20-30 parts by weight of a compound which neutralizes the alkali of the water glass as a hardener, with the elimination of an acid which is stronger than silica. The hardener is in particular ethylene, propylene and / or butylene carbonate. The mass is expediently based on 100 parts by weight of water glass, about 20-40, preferably about 30-35 parts by weight of a - preferably inorganic - thixotropic agent, e.g. an alkali-activated bentonite, and about 10-40, preferably about 20-30 parts by weight of a plasticizer, in particular a silane emulsion, are added. |