chapter
14 Pages

## Monitoring of macrocell corrosion rate in existing structures

ByS. Miyazato

ABSTRACT: Macrocell is formed at bending cracks in concrete. Also, it locally induces the high corrosion rate. However, only the microcell corrosion rate has been measured in the existing concrete structures. Based on the above background, a method for estimating the macrocell corrosion rate was proposed and the macrocell corrosion rate was monitored at the existing reinforced concrete structures. As results, 1) the macrocell corrosion rate was monitored with the non-destructive tests at the existing reinforced concrete structures. 2) The electric circuit model, which simulated macrocell in reinforced concrete, was proposed. 3) The validity of this model was confirmed by the tests using the mortar specimen and the existing reinforced concrete structures.