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Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration in concrete. According to NACE International (National Association of Corrosion Engineers), corrosion is “the destruction of a substance (usually a metal) or its properties because of a reaction with its environment”. The corrosion of structural steel is an electrochemical process that requires the simultaneous presence of moisture and oxygen. Essentially, the iron in the steel is oxidised to produce rust, which occupies a greater volume than the steel. This expansion creates tensile stresses in the concrete, which causes cracking, delamination, and spalling.
Chapter 10 describes some of the corrosion prevention methods to protect steel from corrosion. The protection methods addressed are producing low-permeable concrete, using corrosion-resistant reinforcing bars (stainless, galvanised, epoxy coated, and glass fibre-reinforced polymer bars), concrete surface treatments, corrosion-inhibiting admixture, and electrochemical technique (cathodic protection).
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- Corrosion of Embedded Metals in Concrete
- Chapter 10