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Investigations into the cause and consequence of incipient anodes in repaired reinforced concrete structures

conference contribution
posted on 18.11.2015 by Christian Christodoulou, Chris Goodier, Gareth K. Glass
The incipient anode (or halo) effect often occurs on repaired reinforced concrete structures. The diagnosis of this problem is widely reported in literature to be macrocell activity. It is deemed that the cause of incipient anodes is the loss of the natural cathodic protection provided by the corroding steel to the steel in the parent concrete adjacent to the patch repair. This diagnosis however, is based on very limited data. Indeed recent potential measurements on field structures repaired with cementitious proprietary materials have provided data that suggests that macrocell activity is not a cause of incipient anode formation but is instead a consequence. Alternative mechanisms that may cause incipient anode activity include repair/parent material interface effects, residual chloride contamination within the parent concrete, and/or vibration damage to the steel/parent concrete interface during repair area preparation. The aim of the work presented here was to assess the impact of macrocell activity on the formation of incipient anodes around the perimeter of repairs in patch-repaired reinforced concrete structures. Data was collected from a major multi-storey car park and a bridge structure both located in the UK. The analysis challenges the widespread view that macrocell activity is a cause of incipient anode formation. Indeed this work illustrates that the data supporting the existing diagnosis is not convincing and suggests that macrocell activity is primarily a consequence of incipient anode formation and the cause is more likely to be a result of other factors.

History

School

  • Architecture, Building and Civil Engineering

Published in

4th Int. Conf. on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR)

Volume

1

Issue

1

Citation

CHRISTODOULOU, C., GOODIER, C.I. and GLASS, G.K., 2015. Investigations into the cause and consequence of incipient anodes in repaired reinforced concrete structures. IN: Dehn, F. et al (eds). Concrete Repair, Rehabilitation and Retrofitting IV: Proceedings of the 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4), 5th-7th October 2015, Leipzig, Germany. CRC Press, pp. 841-850.

Publisher

CRC Press (© Taylor and Francis Group, London).

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This conference paper is closed access.

ISBN

1315677644;9781315677644

Language

en

Editor(s)

Dehn, F.;Beushausen, H.D.;Alexander, M.G.;Moyo, P.

Location

leipzig, germany

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