Abstract
This This paper describes an evaluation method for the nondestructive inspection of chloride concentration in concrete using electrical characteristic. First, the fluctuations of impedance-frequency characteristic, phase-frequency characteristic, water content of concrete and water vapor content of the air were measured over a long period. Next, the interrelationships of these parameters were confirmed, and an evaluation formula of chloride concentration was proposed. Finally, evaluation values corresponding to three chloride concentrations (0.0, 1.2, 2.4 kg/m3) were calculated and t-testing was performed. Each of the resulting evaluation values was found to meet the significance level of 0.1%. Thus, the proposed method is shown to be suitable for evaluating the chloride concentration in concrete.
