DETERIORATION PREDICTION OF CONCRETE STRUCTURES CONCERNING REBAR CORROSION DUE TO CARBONATION AND INITIALLY-INDUCED CHLORIDES

Abstract

To clarify the rebar corrosion rate due to carbonation and initially-induced chlorides, an exposure test and an investigation about existing concrete structures were carried out. As the result of an exposure test, it has been observed that the corrosion rate of the lower rebars becomes faster under the influence of macro-cell corrosion in the early stage. But the corrosion rate gradually becomes slower with the passing of the years, and drops into the value evaluated by Masuda's formula. It has been also confirmed that the rebar corrosion rate obtained by investigation of existing structures is nearly equal to that of an exposure test.