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4
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Cl – Cl – Cl – Cl – Cl – Cl – Cl – C
Reinforcement is already in the carbonated zone.
Severe chloride contamination
The reinforcement is close to or right at the surface of the concrete over a large area.
Grade of protection W: Water-proofing
Grade of protection: Chloride-proofing
Grade of protection: additional cover
Mode of action: Suppression of the electrolytic corrosion process by reducing the water content in the concrete (antirust protection by keeping the concrete dry). 1. The coating must prevent water (rain) penetration by exhibiting strong out- ward water-repellency. 2. The coating must exhibit very good water vapour permeability from the inside outwards, so preventing any build-up of water in the concrete. It must be straightforwardly possible for any intrinsic moisture or water which has penetrated from behind through defects, joints etc. to diffuse out again.
Mode of action: Chloride salts are transported into the concrete by water. Chloride-proofing thus means water-proofing. The coa- ting must prevent the penetration of chloride-contaminated water by exhibiting strong outward water- repellency. There must also be good vapour diffusion from the inside out- wards in order to keep the concrete dry, so preventing any chlorides which are already present in the concrete from becoming active.
Mode of action: Additional cover with concrete replacement is necessary for lasting protection. Additional cover in layer thicknesses of 1–3 cm is normally applied by spraying (spray mortar or shotcrete). Spray impact compacts the material so strongly that, with good concrete, virtually no carbonation occurs. Specific carbonation protection is thus not required. A surface coating is applied for reasons of appearance and as weather protection/weather- proofing.
Product solutions KEIM Concretal-W KEIM Concretal-C KEIM Silan-100 (alone or with coatings) KEIM Concretal-Lasur in conjunction with KEIM Silan-100
Product solutions KEIM Concretal-W KEIM Concretal-C KEIM Silan-100 (alone or with coatings)
Product solutions KEIM Concretal-Mörtel-R by wet mortar spraying KEIM Concretal-Lasur KEIM Concretal-W Usable as additional water-proofing:
KEIM Concretal-Feinspachtel may be used for additional blowhole sealing.
KEIM Silangrund KEIM Silan-100
KEIM Concretal-Feinspachtel may be used for additional blowhole sealing.
Usable for prior surface smoothing: KEIM Concretal-Feinspachtel
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