Reliability of Galvanostatic Pulse Technique in Assessing the Corrosion Rate of Rebar in Concrete Structures: Laboratory vs Field Studies
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
Reliability of Galvanostatic Pulse Technique in Assessing the Corrosion Rate of
Rebar in Concrete Structures: Laboratory vs Field Studies
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| Creator |
Vedalakshmi, R.
Balamurugan, L. Saraswathy, V. Kim, S.H. Ann, K.Y. |
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| Subject |
Corrosion Science and Engineering
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| Description |
Corrosion of rebar in concrete structures is one among the various causes impairing its long-term durability. Precise assessment of
corrosion rate (CR) is of prime importance to evaluate the structural safety as well as for estimation of service life of concrete
structures. Among the electrochemical techniques, Galvanostatic Pulse Technique (GPT) is very promising for field mapping due to
its rapidity. The reliability of GPT in determining the CR under passive and active state of rebar has been carried out using small size
laboratory specimens and large scale aged concrete structures. The CR determined by the GPT is compared with the CR obtained by
Electrochemical Impedance Spectroscopy Technique (EIST) and weight-loss method. The study reveals that an anodic pulse of 100
μA with a pulse duration of 10 seconds is able to determine the CR from 1-663 μm/y (from negligible to higher corrosion activity) on
the rebar network more precisely even up to 65 mm of cover concrete. For instance the rebar corroding at higher rate, the CR
predicted by GPT is very close to the CR by weight-loss method whereas it is 20 times less by EIST. In the case of passive state of
rebar, the CR predicted by EIST is very close to weight-loss method whereas GPT predicts 10 times higher. In aged structures, the
change in microstructure of concrete and loss of moisture from the concrete make the potential of rebar and resistivity of concrete
more unpredictable and mislead the status of rebar embedded inside the concrete.
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| Publisher |
Springer-Verlag
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| Date |
2010
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/487/1/2010-106.pdf
Vedalakshmi, R. and Balamurugan, L. and Saraswathy, V. and Kim, S.H. and Ann, K.Y. (2010) Reliability of Galvanostatic Pulse Technique in Assessing the Corrosion Rate of Rebar in Concrete Structures: Laboratory vs Field Studies. Korean Society of Chemical Engineering Journal of Civil Engineering, 14 (6). pp. 867-877. |
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| Relation |
http://cecri.csircentral.net/487/
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