Weak corrosiveness;  carbonization corrosion;  Optimize repairs

The Code for Anti-corrosion Design of Industrial Buildings stipulates the minimum thickness of the protective layer of stressed steel bars in concrete structures, and believes that for reinforced concrete structures that are exposed to weak corrosive media, with the decrease of the protective layer of steel bars, the durability of the structure will also decrease. According to this design requirement, a durability criterion based on concrete carbonization corrosion is proposed, the corresponding durability coefficient concept is defined, and an optimal maintenance strategy of concrete structure with "repairing the old as new" is established accordingly.