The present work describes the design and development of a new corrosion sensor to monitor reinforced concrete structures both under laboratory conditions, as well as for service structures in-situ. This corrosion sensor involves the use of electrochemical noise and guard ring techniques. To test and validate the sensor's overall performance, electrochemical noise measurements were recorded for a total of four reinforced concrete beams, half of which were immersed in tap water, while the other half were in a 3.5% sodium chloride (NaCl) solution (both treatment levels involved an 18-month exposure period). The collected data were compared against polarization resistance (Rp) values recorded for commercial equipment. Some of the advantages of this electrochemical noise corrosion sensor are described and discussed.

Subject
Electric current, Water, Sensors, Corrosion currents, Electrochemical noise, Pipeline integrity management, Platinum, Sodium chloride solution, Electrochemical current, Steel, Electrochemical potential, Corrosion potential, Electrode potential
Keywords:
corrosion sensors, electrochemical noise, guard ring, rebar corrosion, reinforced concrete
NACE International
2008
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