Evaluation of corrosion of steel reinforcement in concrete from potential measurements of embedded reference electrodes
- Rescon AS, Sagstua (Norway)
- Univ. of Oslo (Norway). Centre for Materials Research
The potentials of manganese dioxide electrodes, lead, graphite and some other metals have been measured in the laboratory in synthetic pore water solutions and when the electrodes were embedded in concrete. Measurements have been carried out with the aim of determining the potentials of manganese dioxide, lead and graphite electrodes permanently installed in a large bridge. The measurements were carried out a year after the installation. The latter measurements indicate a significant divergence of the potentials of the electrodes of the same type. The changes with time appeared to be rather small. It is difficult to establish whether a 10 mV change in the potential between the reinforcement steel and a single reference electrode originates from a change of the corrosion potential or drift in the reference electrodes. The much larger response of the potential i that takes place if the corrosion process changes significantly is detectable with all three types of electrodes.
- OSTI ID:
- 128700
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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