Responsive behaviour of galvanic anodes in concrete and the basis for its utilisation |
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Authors: | SP Holmes GD Wilcox PJ Robins GK Glass AC Roberts |
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Affiliation: | aDepartment of Materials/CICE, Civil & Building Engineering, Loughborough University, Leicestershire LE11 3TU, United Kingdom;bConcrete Preservation Technologies, The Sir Colin Campbell Building, University of Nottingham Innovation Park, Triumph Road, Nottingham NG7 2TU, United Kingdom |
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Abstract: | In this study, a unique concrete specimen was used to analyse the response of embedded sacrificial zinc and steel anodes to rainfall and fluctuations in temperature. Current from the zinc and steel anodes increased when the environment was aggressive, showing that the required protection current depends on the present level of corrosion risk. A basis for using the ‘responsive behaviour’ of galvanic anodes is provided by the protective effects of pit re-alkalisation and pH maintenance. By contrast, protection based on achieving adequate polarisation inhibits the use of responsive behaviour and galvanic anodes might only deliver adequate polarisation in aggressive environments. |
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Keywords: | A Steel reinforced concrete A Steel A Zinc B Polarisation C Cathodic protection C Passivity |
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