Experimental Study On Electro-migrating Corrosion Inhibitor For Concrete Durability Guarantee In Marine Environment

Corrosion of concrete reinforcement is one of the main reasons resulting for early failure of reinforced concrete durability,and corrosion protection of reinforced concrete has always been the focus of research.The addition of corrosion inhibitor to the new reinforced concrete structure is one of the commonly used methods of durability protection,however,it is difficult to effectively protect the steel bar when the amount of the inhibitor is too large and it is difficult to reach the surface of the steel bar by the diffusion and penetration of the inhibitor itself.Bidirectional electromigration rehabilitation technology is an important way to ensure durability in combination with the principle of electrochemical dechlorination and the principle of reinforcing steel rust inhibitor.When the external electric field is discharged,the electromigration corrosion inhibitor will be transferred to the surface of steel bar.However,the influence of the electrical migration resistance inhibitor on the durability of concrete in the newly built reinforced concrete structure is less researched.Based on this,combined with Bidirectional electromigration rehabilitation technology,the influence of imidazoline quaternary ammonium salt and three ethylene four amine two kinds of electromigration rust inhibitors on marine environment concrete durability is studied through indoor experiments.The main contents are as follows:Based on the performance requirements,a double ring imidazoline quaternary ammonium salt electro-migrating corrosion inhibitor was developed,and the effect of rust resistance was preliminarily verified in the simulated concrete pore fluid.The electromigration resistance and rust resistance of two kinds of rust inhibitors in chloride-corroded concrete were studied.The results show that the electromigration and inhibition ability of imidazoline quaternary ammonium salt is stronger than that of three ethylene and four amine,and the dechlorination efficiency of steel bars is above 90%,indicating that the electro-migrating corrosion inhibitor,does not affect the discharge of chloride ions in existing concrete structures.The effects of imidazoline quaternary ammonium salt and three ethylene four amine on the durability of concretewere studied by adding two electro-migrating corrosion inhibitor in ordinary concrete.Corrosion potential of reinforced concrete with imidazoline quaternary ammonium salt corrosion inhibitor is better than triethylenetetramine,imidazoline quaternary ammonium salt rust inhibitor is better than three Ethylene tetramine.The concentration of chloride ions in concrete specimens with corrosion inhibitors tends to decrease along the thickness of the protective layer,and the chloride ion erosion is more obvious in the area of concrete about 25mm from the concrete surface.The content of two kinds of rust inhibitor tends to decrease first and then increase along the concrete protection layer,and the lowest rust inhibitor content is at 30mm from the concrete surface.The effects of imidazoline quaternary ammonium salt and three ethylene four amine on the durability of concretewere studied by adding two electro-migrating corrosion inhibitor in sea sand seawater mixing concrete concrete.The corrosion potential of steel reinforced with two kinds of rust inhibitor in the concrete was studied.The results show that the corrosion potential of reinforcing steel is moved forward positively and play a protective role on the steel,moreover,increasing the amount of rust inhibitor in a certain volume range can not significantly enhance the rust protection effect of rust inhibitor on reinforcing bar,and the effect of imidazoline quaternary ammonium salt is better than that of three ethylene and four amine.In a certain extent,the content of the chloride ion in the concrete specimen is influenced by the larger admixture of the rust inhibitor.The content of internal resistance rust inhibitor content of internal electrical migration rust inhibitor is approximately decreasing and then increasing.