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Electrochemical Techniques to Detect Corrosion Stage of Reinforcement in Concrete Structures: Suistainable Bridges.  Background document SB3.9
BAM, Berlin, Germany.
BAM, Berlin, Germany.
BAM, Berlin, Germany.
2007 (English)Report (Refereed)
Abstract [en]

In order to initiate necessary rehabilitation measures at the right moment from the safety aspectas well as the economic point of view non-destructively determined information on the current corrosion behavior of the reinforcing steel have a high importance. For that various electrochemical measurement techniques are available, like measurement of corrosion potential, determination of short-circuit currents on corrosion cells, and external controlled electrochemical investigations. In passive conditions the rebar potentials can fluctuate in a wide range depending on different parameters. In some potential areas a clear classification of active (corroding) or passive conditions is not possible. In such cases measurements by Galvanostatic Pulse Method (GPM) might be supportive. Evaluation of the results enables a much better classification regarding the situation at the reinforcement. However the applicability is being discussed controversially. Basing on differences of own and literature results gathered on park decks and bridges as well as in special laboratory approaches it is necessary to evaluate the limitations on real structures. Right now there is a big skepticism in terms of correct applicability of corrosion rate measurement devices. A very good evaluation of the reinforcement corrosion behavior has been achieved in laboratory. In potential ranges, where a clear assignment to passivity or activity could not be made, GPM-technique allows a better evaluation. It can be stated, that GPM is suitable for evaluation of the corrosion rate on uniformly corroding small specimens. In case of very local corrosion spots and wide passive zones on a test plate, also a good qualitative evaluation of the corrosion stage could be achieved using potential mapping. Here it turned out that relatively small corrosion spots only can be detected by a narrow measurement grid. However an evaluation of corrosion behavior in these conditions by GPM seems to be impossible. The GPM-technique is applicable if corrosion conditions on the object are relatively uniform. Only very local corrosion spots on an almost passive structure limit the usability of the achieved values. The limitation and applicability of the technique on real structures have been evaluated on a bridge without significant corrosion.

Place, publisher, year, edition, pages
2007. , p. 35
Keywords [en]
Corrosion Detection in Reinforced Concrete Bridges, Galvanostatic Pulse Method
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-75307OAI: oai:DiVA.org:ltu-75307DiVA, id: diva2:1337404
Note

EC Sixth Framework Program

Sustainable Bridges – Assessment for Future Traffic Demands and Longer Lives

TIP3-CT-2003-001653

Available from: 2019-07-14 Created: 2019-07-14 Last updated: 2019-08-14

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