Electrocorrosion protection method, selection method of backfill material, installation method of drainage terminal, and concrete structure

摘要

PROBLEM TO BE SOLVED: To provide effective electrocorrosion protection in a region other than the backfill portion, and to suppress supply of an excessive anticorrosion current to a steel material portion located in the backfill portion. I will provide a. According to the electrolytic corrosion protection method of the present invention, the chloride ion content of a reference concrete portion in a reference structure including a reference backfill portion and a reference concrete portion, and a reference structure in a steel material embedded in the reference structure. The ratio of the electrical resistivity of the reference backfilling part to the electrical resistivity of the reference concrete part when the polarization amount of the steel material in the reference backfilling part and the reference concrete part becomes 100 mV when an electric current is supplied from the anode material installed on the object. The target electrical resistivity ratio, which is the reference electrical resistivity ratio corresponding to the chloride ion content of the target concrete structure, and the target concrete structure obtained from the scatter diagram showing the relationship with the standard electrical resistivity ratio. The required electrical resistivity is calculated from the electrical resistivity of the object, and a backfill portion having an electrical resistivity exceeding the required electrical resistivity is formed. [Selection diagram] FIG. 7