What is the purpose of applying corrosion inhibitors or protective measures in reinforced concrete?

• A. Reduce reinforcement corrosion risk
• B. Increase cement strength
• C. Change color of concrete
• D. Speed up curing

Answer: (A)

Preventing corrosion of the steel in concrete is the main goal. Corrosion inhibitors and protective measures are used to lower the likelihood that embedded reinforcement will corrode by slowing the diffusion of moisture and chlorides, maintaining a protective, passive condition of the steel, and providing barriers between steel and the aggressive environment. This helps extend the life of reinforced concrete members in bridges where de-icing salts and carbonation are common threats. For example, admixtures like calcium nitrite promote passivity in the steel, while surface sealants or coatings reduce water and ion ingress. So the purpose is to reduce reinforcement corrosion risk, rather than increasing cement strength, changing color, or speeding up curing.