Abstract
The need for proactive maintenance of reinforced concrete structures with non-destructive testing (NDT) is less disputable today than ever. One of the most promising strategies in this regard is the in-situ measurement of the reinforcement corrosion rate. This study explored the reliability of modulated current confinement method (hereafter MCC) based on a review of in-situ measurements made with that technique in real-life structures over a 13-year period. The most prominent problems detected included defective confinement of the polarization current in low-resistivity environments and over-polarization of passive reinforcement. The findings, which showed enhancement of MCC reliability to depend on improving the electrochemical current regulation and control methodologies presently in place, are being applied to improve the design of the next generation of corrosion meters.
Highlights
RESUMEN: Experiencia en la monitorización de la corrosión in situ en estructuras de hormigón: posibles mejoras en el método de resistencia a la polarización controlada por corriente
Most of the handheld corrosion meters used for on-site measurements deploy electrochemical techniques based on the Stern-Geary linear polarization resistance (RP) method, which is suitable in the presence of low reinforcement polarization
Those findings revealed the need to improve MCC both to ensure that IXCE > internal counter electrode (ICE) under the conditions prevailing in the steel-concrete system to be assessed and that effective rebar polarization (EPOL) lies within the 5 to 30 mV range
Summary
RESUMEN: Experiencia en la monitorización de la corrosión in situ en estructuras de hormigón: posibles mejoras en el método de resistencia a la polarización controlada por corriente. To address that problem European standards such as Eurocode 2 [1] set out limit state-based specifications for reinforced and prestressed concrete structures Such codes require the inclusion of an inspection and maintenance plan as part of the initial design to ensure performance does not decline below certain minimum values during a structure’s service life. Examples include Gecor [7], patented by patented by CSIC and Geocisa (Spain), and GalvaPulse, a device manufactured by Germann Instruments (Denmark) [8] Both deploy the galvanostatic pulse technique (GPT) to deliver corrosion rate measurements quickly [9] by calculating RP from the potential-time (E-t) curve plotted with the reinforcement polarization values generated during application of a short current pulse
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