Applicability of cathodic protection to reinforced concrete subjected to chloride induced deterioration and ASR

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Investigation of the effects of electrical current applied to reinforced concrete on alkali content distribution and ASR expansion produced the following results. (1) An increase in the current density in the specimen was accompanied by an increase in the concentration of alkaline metal ions around the reinforcing steel, and the amount of ion migration is considered to depend on the cumulative current density. (2) The current promoted ASR expansion. The dependence of the pessimum value on the current density was also confirmed. (3) A current density of about 5 mA/m2was not found to promote ASR expansion to a large degree. (4) ASR expansion can be expressed as a function in terms of the current density and current duration. (5) By supplying a large current densities(1A/m2, 2A/m2) before application of the cathodic protection, ASR expansion during application of the cathodic protection could be restrained.