Abstract
For rehabilitating the chloride contaminated concrete structure to extend its service life, an electrochemical chloride extraction (ECE) treatment with simultaneous migration of silicate ion was proposed. The electrochemical technique is capable of alienating the chloride ions from the reinforcement and simultaneous injecting SiO32− into the mortar to interact with Ca(OH)2, resulting in mortar desalination and densification. By a comparative experiment, the chloride extraction efficiency and corrosion properties of steel reinforcement in sodium chloride solution after the electrochemical treatment were investigated by chloride potentiometric titration, corrosion potential (Ecorr) and corrosion current density (Icorr) determined by electrochemical impendence spectroscopy (EIS). The microstructure of mortar after the electrochemical treatment was observed using mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), differential thermo-gravimetric analysis (DTG) and X-ray diffraction (XRD). About 40–55% of initial chloride was removed from the mortar using a current density of 2A/m2. The electrochemical treatment can effectively prolong the initiation time of secondary corrosion for the steel reinforcement, due to the mortar densification by electro-migration of silicate ion.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
