Corrosion damages in chloride deteriorated reinforced concrete structures require expensive repair measures. Especially traffic areas exposed to de-icing salts and also structures in coastal regions or aggressive soils are affected. On parking decks and bridges the chlorides mainly effect on horizontal areas and could reach the reinforcement within a very short time.

This paper will present investigations of an integrated protection system basing on thermal-sprayed zinc and a sealing coating. This protection system was applied to 40 reinforced concrete specimens, varying in water/cement-ratio, chloride content, concrete cover and reinforcement density. Results were compared to them of additional 20 specimens, which were thermal-sprayed only or completely uncoated.

The effect of cathodic protection by the thermal-spayed zinc coating is proven by measurements of protecting currents and protection potentials as well as depolarization measurements. The drying out behavior of the specimens was recorded by moisture measurements with Multiring-electrodes.

Subject
Depolarization, Zinc rich coatings, Cathodic protection, Moisture, Rebar, Concrete surfaces, Current densities, Reinforced concrete, Corrosion protection, Zinc, Chlorides, Drying, Concrete
Keywords:
Chloride Induced Corrosion, Thermal-Sprayed Zinc, Moisture Content, Embedded Sensors
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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