Effect of Material Property on Bidirectional Electro-migration Rehabilitation with Hexane Diamine Inhibitor

Concrete structures in marine environment were susceptible to corrosion by chloride salts, causing corrosion of steel bars, and causing durability problems for offshore structures. The two-way electroosmosis repair technology could form a rust inhibitor passive film on the surface of steel bar while removing the chloride ions in the concrete, which was a good structure life extension technology. Using 1,6-hexamethylene diamine as rust inhibitor, under the condition of energizing current of 3 A/m² and energizing time of 9 d, the chloride salt corroded reinforced concrete members were repaired. The influence of concrete strength and protective layer thickness on the effect of the two-way electroosmosis repair was studied. The results showed that the two-way electroosmosis effectively improved the durability of the steel bars in the concrete; the chloride ion removal rate, the migration amount of rust inhibitors and the corrosion resistance of the steel bars in the concrete decreased with the increase of the concrete strength.