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keim concretal ® – the beaut y of concrete !
PROTECTIVE OPTIONS FOR CONCRETE
WEATHERING PROTECTION Silicate coatings can protect concrete surfaces long- term from weathering thanks to their strengthening action (silicification). An extra treatment of the subs- trate with a hydrophobing agent even increases the weathering protection. CO PROTECTION The concrete surface must be sealed in such a way that CO 2 cannot penetrate. For a functioning CO 2 protection the pores and blowholes have to be always closed by filling (full-cover filling) before coating. Just a coating alone would be insufficient in this case. 2
Good concrete, very low carbonation
Carbonation zone is very close to the reinforcement
WATER PROTECTION Water accumulation in the concrete is prevented by a high water-repellency of the outside surface and extreme water vapour permeability from inside to the outside (rust protection by keeping the concrete dry).
Reinforcement is already located in the carbonated area
CHLORIDE PROTECTION Chloride salts are transported into the concrete by water. Chloride protection also means water protection. In this way the penetration of chloride-loaded water is prevented and dry concrete guaranteed. Chlorides that are already present in the concrete cannot become active. ADDITIONAL COVERING Additional cover with a concrete replacement material is required for lasting protection. By spray application of an extra layer thickness from 1 to 3 cm is the material strongly compacted in order to avoid carbonation. A subsequent coating of the surface is performed for visual reasons and as weathering protection.
High chloride load
Large areas of the reinforcement are close or right at the concrete surface
Carbonated concrete Non-carbonated concrete
Carbonation end Steel reinforcement
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