Electrochemical Noise Measurement to Assess Corrosion of Steel Reinforcement in Concrete

Douglas Mills, Paul Lambert, Shengming Yang

Research output: Contribution to JournalArticlepeer-review

Abstract

The electrochemical noise method (ENM) has previously been employed to monitor the corrosion of steel reinforcement in concrete. The development of solid-state Ag/AgCl-based probes and dedicated monitoring technology (ProCoMeter) now offers a wider range of ENM configurations. The present study involves the laboratory investigation of three mortar samples containing steel bars and varying additions of chloride, with a view to future field application. ENM could be used to provide corrosion information on reinforcement without the need to provide direct electrical connections to the steel and without the risk or inducing or increasing corrosion. In addition to half-cell potentials, measurements were made using ENM in three different probe configurations over a total test period of 90 days. The samples were then broken open and the bars extracted and cleaned. A comparison was then made between the calculated metal thickness loss obtained from the Rn values and the actual metal thickness loss. The results showed that each configuration was able to order the results in the expected manner, with the simple single substrate (SSS) arrangement providing the best correlation with direct measurements. The study is ongoing with the intention of measurements being obtained in situ on existing reinforced concrete structures.
Original languageEnglish
JournalMaterials
Volume14
Issue number18
Early online date18 Sep 2021
DOIs
Publication statusE-pub ahead of print - 18 Sep 2021

Keywords

  • corrosion
  • reinforcement
  • concrete
  • steel
  • electrochemical noise

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