Abstract
Reduction of the chloride ion ingress in concrete will be greatly improved by adding blast furnace slag fine powder to concrete. Its durability has, however, not been fully verified in actual corrosive environment. In addition, the possibility of reinforcing steels' corrosion has remained as ever; hence a technique for observing and predicting the internal corrosive environment needs to be established. In this study, exposure testing has been operated at a site near seashore to verify the durability of concrete mixed with ground granulated blast-furnace slag 6000. In the test, the apparent diffusion coefficient has been investigated and electrical potential of rebar in concrete has been telemetered with a monitoring system newly developed in this study. Main conclusions obtained in this study are as follows: [I] the apparent diffusion coefficients obtained from the specimens exposed for three years show the curve close to the prediction equation defined in the Standard Specification for Concrete Structures with changing the third term of the equation. ［II］ The monitoring system has allowed to observe corrosion potential in a long period and to monitor remotely the changes of corrosive environment over time.
