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Half-cell potential measurements to assess corrosion risk of reinforcement steels in a PC bridge



Title: Half-cell potential measurements to assess corrosion risk of reinforcement steels in a PC bridge
Author(s): E. Nakamura, H. Watanabe, H. Koga, M. Nakamura, K. Ikawa
Paper category : conference
Book title: RILEM Symposium on On Site Assessment of Concrete, Masonry and Timber Structures - SACoMaTiS 2008
Editor(s): L. Binda, M. di Prisco, R. Felicetti
Print-ISBN: 978-2-35158-061-5
e-ISBN: 978-2-35158-075-2
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 109 - 117
Total Pages: 9
Nb references: 7
Language: English


Abstract: Half-cell potential measurements are simple, inexpensive and virtually non-destructive techniques to assess the corrosion risk of steels in concrete. This paper reports a practical application of half-cell potential measurements on an existing prestressed concrete (PC) bridge near the coastline in Japan. The PC bridge shows no signs of deterioration on the concrete surface.
The measured values of the half-cell potential fluctuate due to several factors: the temperature, the type of reference electrode, and the pre-wetting time. However, the negative potential area on the equipotential contour map corresponds to high chloride content and localized corrosion. The numerical criteria disagree with the corrosion condition of steels.
Hence, the equipotential contour map is a more reliable tool for detecting localized corrosion than the numerical criteria, even if there are no signs of deterioration due to corrosion on the concrete surface.


Online publication: 2009-05-26
Publication type : full_text
Public price (Euros): 0.00