Repair, bonding and coating of precast concrete elements

Precast concrete elements are becoming increasingly important in many construction projects due to their technical and economic advantages. The surface quality is a particularly important criterion when using these precast concrete units. Visible manufacturing defects of the surface quality as well as transport and assembly damage must therefore be repaired quickly, concealably and economically with systems specially adapted to these requirements. Any cracks must be closed with a force-fit using 2-component reaction resins.

Concrete repair

Simple & safe to the goal

1. The substrate must be clean and load-bearing. All adhesion-impairing particles of the defective areas must be completely removed.
2. The application of the shrinkage-compensated, quick-setting and polymer-modified patching mortar weber.rep 763 is carried out either unblended (without sand) up to 5 mm thickness or blended with sand up to 10 mm.
3. Edge break-outs are repaired with the concrete repair and re-surfacing mortar weber.rep R4 duo.
4. Broken parts of precast concrete stairs are repaired with weber.rep R4 duo.
5. Cracks in the prefabricated concrete units are closed with the 2-comp. quick-curing epoxy resin primer weber.prim 806. If joints between concrete elements should be closed with an elastic sealant, like the PU industrial joint sealant weber.tec 977. Furthermore, it's bonding on the joint sides and bottom must be avoided by filling the joint space with the closed moltoprene filling backrod weber.sys Fugenhinterfüllmaterial.
6. Cracks are closed by injecting the 2-component injection epoxy resin weber.tec 945. The reaction resin has a high creep capacity and builds up good adhesion between the crack flanks. Any resin that may escape is scattered with oven-dried quartz sand.
7. For improving the chemical resistance of prefabricated concrete units, their interior side can be covered with the epoxy resin coating weber.tec 796.
8. The bonding of installation parts, e.g. ladder elements in shafts, is carried out with the 2-comp. reaction resin adhesive weber.rep 766. For bonding small and smooth concrete joint sides, the use of an adhesive in thinner layers is recommended, e.g. the 2-component multi-use epoxy resin weber.tec 793.