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STUDY ON THE CORROSION PROTECTION MANAGEMENT IN CATHODIC PROTECTION WITH IMPRESSED CURRENT SYSTEM FOR RC STRUCTURES

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  • 鉄筋コンクリート構造物における外部電源方式電気防食工法の防食管理方法に関する検討

Abstract

 Cathodic protection is a highly reliable corrosion protection method for re-bar in concrete. Generally, “100-mV Polarization Shift or Depolarization Shift” is used as a criterion of cathodic protection for rein-forcing steel in concrete.<br> In this study, we examined the relationship between potential shift values and effect of cathodic protection, using concrete specimens in which small, electrically-connected steel splits were embedded. As the result, we found that the corrosion rate can be reduced by the cathodic protection applied in the range of less than 100-mV polarization shift. However, from the point of view to stop the corrosion reaction electrochemically, we concluded that 100-mV polarization shift is appropriate as the criterion.<br> Furthermore, we proposed a method of supplying protection current, the installation position of a reference electrodes, and the design method of criterion of cathodic protection for corrosion rate.

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