Rehabilitation Effects of Electrochemical Realkalization with Alcamines Inhibitors

The feasibility of alcamines inhibitor auxiliary electrochemical realkalization repair techniques for carbonization steel reinforced concrete was investigated.The migration of ethanolamine and dimethylethanolamine(DMEA) in concrete and the inhibition effect of the inhibitors in the simulated system which included 2g/L NaCl,0.01mol/L NaOH and saturated calcium hydroxide mixed solution were measured by using electrochemical test techniques and analysis methods.The results indicate that the rate of the inhibitors passed through 30mm concrete under the electric field formed by the 2 A/m2 constant current density is significantly higher than the case where no current passed,which shows that the electric field promote the migration of alcamines inhibitor.With the concentration increasing of ethanolamine and DMEA,their inhibition effects are also gradually improved.At the same concentration,DMEA manifested excellent inhibition effect.And the inhibition rate of 0.04mol/L DMEA for Q235 steel is up to 95.78%.The corrosion potential is more positive and corrosion current density(icorr) became smaller when sample is immersed in electrolyte solution with DMEA.Electrochemical realkalization with DMEA could enhance the effects of rehabilitation.