Carbonation of Concrete and Corrosion

Carbonation is a simpler process than chloride attack. Atmospheric carbon dioxide reacts with pore water to form carbonic acid. Carbonic acid reacts with calcium hydroxide and forms solid calcium carbonate. The pH drops from about 13 [Pg.129]

Steel bridges corrode on exposure of steel to atmospheric conditions. The extent of corrosion is greatly enhanced because of marine (salt spray) exposure and other corrosive industrial environments. The only corrosion preventive method is to provide a barrier coating such as paint. [Pg.130]

There is considerable need for additional studies on innovative constmction materials such as corrosion-resistant alloy/clad rebars (both metallic and nonmetallic) and more durable concretes with inherent corrosion-resistant properties. Further research and development in rehabilitation technologies that can mitigate corrosion with minimal maintenance requirements such as sacrificial cathodic protection (CP) systems is desirable. [Pg.130]