FUNDAMENTAL STUDY ON DIRECT CURRENT RESISTIVITY METHOD TO PRESUME THE INNER PARTS OF RC STRUCTURES

Abstract

Now, the half cell potential method and the polarization resistance method are mainly used as nondestructive testing methods that presume the corrosion state of reinforcing steel in concrete. However, the destruction work is necessary for the two examination methods to expose edge of reinforcing steel in concrete.
Therefore, we executed the fundamental study that presumed the inner parts of reinforced concrete by using the direct current resistivity method without doing the destruction work. We made the test pieces of reinforced concrete that had non-corrode steel, corrode steel and cave, and, we experimented for inner presumption of the test pieces. Then, it has been understood to be able to presume the presence of reinforcing steel, the corrosion situation of reinforcing steel and the presence of cave from the experiment result.
In addition, we developed the three dimensional electric field program of the finite element method, and did the numerical simulation. Then, we were able to confirm our electric field program was effective to inner presumption of RC structures from the comparative study of experiment results and analytical results.