Investigation of the protective effect of repair mortars with migrating corrosion inhibitor in deterioration of structural damage

摘要

Migrating corrosion inhibitors have long been used for the protection of reinforced concrete. The aim of the present work is to investigate, in the presence of chloride ions, the protective effect of migrating corrosion inhibitors, against rebar corrosion, in cases of fiber reinforced repair mortars, used for the rehabilitation of old structures. The Strain Gauge measurement technique was used for fast corrosion measurement tests, under anodic potential application in a corrosive environment of 3.5% wt NaCl solution. The corrosion protection effectiveness was also tested by galvanic current measurements between different categories of specimens in order to assess the galvanic corrosion between repaired and non-repaired areas. According to these investigation the positive effect of the migrating corrosion inhibitors in fiber reinforced mortars against corrosion of the rebars is evident, providing a prevention of steel rebars corrosion in the cases of repairing concrete structures. The presence of fiber reinforcement in repair mortar specimens prevents the microcracking effects, resulting in a decrease of concrete cracking due to reinforcement corrosion.