Standards Development

Scope

This method covers the equipment, materials, specimen preparation, procedures, results and reports for testing and evaluating the corrosion of steel bar embedded in concrete structure exposed to total corrosion zones in marine environments. 

Purpose

The main reason for the deterioration of durability of reinforced concrete structures is environmental effects, and the corrosion of the steel bar induced by chloride attack is one of the most important causes in marine environment. Generally, the marine environment can be divided into five zones in the vertical direction, atmospheric zone, splash zone, tidal zone, immersion zone, and buried zone.

The environmental effects of the area are different, resulting in different corrosion rates of the steel bars in different environmental sections. A large number of reinforced concrete structures, such as docks, bridge piers in the coastline are affected by the different corrosion zone impacts, leading to their uneven corrosion degree in the vertical direction. However, worldwide scholars mainly focus on the corrosion behaviors of the steel bars in a certain marine environment nowadays, which cannot reflect the influence of different corrosion zones and guide the practical engineering project.

Moreover, the test and evaluation for the corrosion of steel bar in marine environments with total corrosion zones does not have a uniform standard, and it is necessary to set a standard to simulate marine environment with total corrosion zones and study the effect of different marine zones on the corrosion of steel bar.

This standard is to invent a device that can simulate marine environments with total corrosion zones and propose a method for testing and evaluating the corrosion of the overall steel bar embedded in concrete structure under marine environments, with the aim of providing the basis for the service life prediction and evaluation and the durability design of concrete structures.