Repairing Concrete: Being Proactive with Protective Systems

Protective systems are used to reduce the danger of corrosion of embedded metals, like reinforcing steel. Since corrosion is an electrochemical reaction, electrical systems can be installed to eliminate corrosion. The most common of these is called cathodic protection, where a sacrificial metal is connected to the reinforcement to redirect the corrosive currents away from the reinforcing steel. These systems can be passive or active, meaning an external electrical current is impressed on the structure. This is a proven technique but expensive. Bridge decks and concrete balconies are the most common applications.

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