How to prevent the steel inside the cement column from rusting?

        Prevention methods:

       1, general housing concrete column as long as the outside of the concrete protection layer thickness standard, there will be no steel corrosion.

      2, in special engineering, such as bridge engineering, wharf, dam and so on, some measures to prevent the corrosion of steel in concrete are adopted. The current anti-rust measures are mainly anti-rust coating method, cathode protection law, inert steel bar method and anti-rust cement concrete method. Coating method mainly includes cement concrete surface coating, cement concrete surface polymer impregnation, steel surface coating and so on. This kind of method mainly cuts off the path of chloride ion or other corrosive medium to the surface of steel bar by setting a dense layer so as to prevent the corrosion of steel bar; Cathodic protection mainly includes sacrificial anode, impressed current and other methods, which mainly prevent the corrosion of steel bar by compensating the electrons lost by iron atoms. Inert steel bar method mainly by using stainless steel bar, carbon fiber bar and other low activity of the metal or inert materials to partially or completely replace the steel bar. These methods require high construction technology, complicated process and high maintenance cost in the later stage. At present, most of them are applied to the auxiliary anti-corrosion of key parts or components of large complex reinforced concrete Bridges, and a lot of work needs to be done to popularize them generally.