Best Way To Remove Rust From Rebar
Concrete is significantly damaged due to erosion of embedded steel rebar.
Reinforcing bars in concrete area unit are safeguarded from erosion with a thin chemical compound layer that develops on their surface owing to extreme alkalinity, i.e., the high hydrogen ion concentration price concerning the surrounding concrete. Corrosion may begin when the protecting layer is damaged by chloride ingression.
The rusting of steel reinforcement may occur for the following reasons :-
• Rust happens because of cracking of the protective layer (concrete cover) and the emergence of rust on the surface of the reinforcing steel.
• Rusting of the reinforcing steel starts in the form of a small click in the sikhs, and then it expands gradually to form general rust.
It occurs for the following reasons:
a. Carbonization because of the atmosphere encircling the concrete.
b. Effect of chlorides on concrete (from the soil or owing to non-use of water appropriate for mixing)
c. Penetrating of salts to the concrete
The following measures should be taken for reinforcing steel to get rid of rust.
1. Cathodic protection is the most effective process for coastal enterprises, but it is very costly for application. It is recommended to carry out a study for selecting the perfect process to fulfill the purpose.
2. Inclusion of some materials to the cement to decrease its penetrability. The process is not so expensive for cathodic protection, but the age of protection is lower.
3. Application of rust inhibitors: The first type is based on the work of protection around the reinforcing steel and the other type to resist the entering of oxygen inside the concrete.