Nondestructive evaluation (NDE) for corrosion of reinforcement in concrete is in critical demand for maintenance of concrete structures. Although such electrochemical methods as based on half-cell potential, polarization resistance, and concrete resistivity are available, estimation of corrosion in concrete is marginally successful. Consequently, a compensation technique of the half-cell potential is developed by simplifying the boundary element method and taking into account the concrete resistivity as IBEM. In combination of this compensation with the polarization resistance, a practical NDE is proposed. After confirming an applicability of the procedure in laboratory tests, problems of in situ observation are examined.
