STUDY ON FIELD CORROSION MONITORING OF REBAR IN CONCRETE BY GUARD RING METHOD

J Chin Soc Corr Pro

2006, Vol. 26

Issue (5): 257-262 DOI:

Research Report

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STUDY ON FIELD CORROSION MONITORING OF REBAR IN CONCRETE BY GUARD RING METHOD

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华中科技大学

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Abstract In this paper Guard Ring Electrode was applied to study corrosion behavior of rebars in concrete. The current ratio of Counter Electrode (CE) and Guard Ring Electrode(GE) had been discussed during rebars were polarized. Furthermore, we discussed the effect of GE current for the sake of obtaining accurate polarization resistance Rp value. In order to achieve real Rp value, CE current must be confined in the projection rebar area below CE. During the experiment, the potential difference of concrete surface was monitored at the same time. However, it is insufficient considering only two-dimension current distribution. Generally very high concrete resistance tends to result in small measuring Rp value because of the over compensation of CE current. In order to obtain real Rp value, three-dimension other than two-dimension current distribution must be considered. Compared with uniform polarization result, it can be seen when rebars was active, CE polarization current could be confined preferably in the constant rebars area below CE by GEM, indicating the GEM could be used to monitor the corrosion behavior of rebars in concrete more accurately than other custom LPR method.

Key words: GE uniform polarization reinforced concrete corrosion confinement

Received: 07 July 2005

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. STUDY ON FIELD CORROSION MONITORING OF REBAR IN CONCRETE BY GUARD RING METHOD. J Chin Soc Corr Pro, 2006, 26(5): 257-262 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I5/257

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