Dear Saleh,

You may have a look here:

http://www.sciencedirect.com/science/article/pii/S1877705815011182

Yes, the following article is very useful:

Article The Influence of Limestone and Al2O3 Content in the Slag on ...

The hydrated cement concrete has a higher tendency of combining with carbon dioxide, atmospheric CO2, forming carbonates, which partly neutralizes the alkaline nature of cement concrete. This process is known as carbonation. When carbonation depth exceeds depth of cover to the reinforcement, the salt ions find a suitable environment leading to greater steel corrosion.

Dear Dr., Lukasz , thank you so much for your interesting and valuable comments.

The hydrated cement concrete has a higher tendency of combining with carbon dioxide, atmospheric CO2, forming carbonates, which partly neutralizes the alkaline nature of cement concrete. This process is known as carbonation.

the following article is very useful:

Article The Influence of Limestone and Al2O3 Content in the Slag on ...

Concrete has a higher tendency of combining with carbon dioxide, atmospheric CO2, forming carbonates, which partly neutralizes the alkaline nature of cement concrete. This process is known as carbonation.