Diagnosing the cause of incipient anodes in repaired reinforced concrete structures |
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| Affiliation: | 1. AECOM Europe, Colmore Plaza, 20 Colmore Circus Queensway, Birmingham B4 6AT, UK;2. Loughborough University, School of Civil and Building Engineering, Loughborough, UK;3. Concrete Preservation Technologies, University of Nottingham Innovation Lab, Nottingham NG7 2TU, UK;1. Department of Civil Engineering and Applied Mechanics, McGill University, Macdonald Engineering Building, Room 492, 817 Sherbrooke Street West, Montreal H3A0C3, Canada;2. Department of Civil Engineering and Applied Mechanics, McGill University, Montreal, Canada;1. Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung, 202, Taiwan;2. Department of Fire Science, WuFeng University, Chiayi County, 621, Taiwan;1. Université de Toulouse, UPS, INSA, LMDC 135 avenue de Rangueil, 31077, Toulouse Cedex 4, France;2. R3S, N°18 ZA Les Pignès, 09270, Mazères, France |
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| Abstract: | The incipient anode (or halo) effect often occurs on repaired reinforced concrete structures. The diagnosis of this problem is widely reported to be macrocell activity. This diagnosis is based on very limited data. Indeed potential measurements on field structures repaired with proprietary materials have provided data that suggest that macrocell activity is not a cause of incipient anode formation. 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. |
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