Cathodic protection on the UK's Midland Links motorway viaducts

•The Midland Links motorway viaducts (MLMV) are a series of reinforced concrete structures comprising 21 km of elevated motorway around the outer circumference of Birmingham. Deterioration was identified early in their serviceable life due to chloride induced corrosion of the steel reinforcement. An electrochemical treatment utilising an impressed current cathodic protection (ICCP) was successfully trialled in 1987 with the first large-scale commercial application of the treatment on the network in 1991. Since then it has been the principal corrosion management strategy for the MLMV, with 740 structures currently protected by ICCP. The aim of this paper is to offer a brief historical review of the MLMV network, discuss the deterioration mechanisms and review the historical developments of ICCP together with its overall performance as a corrosion-management method. Recent developments in cathodic protection technology and secondary beneficial effects of the ICCP previously not recognised are also discussed on how they can potentially result in significant cost savings for maintenance agencies for this and other similarly protected structures.

[1]  C. Page,et al.  Aspects of the electrochemistry of steel in concrete , 1982, Nature.

[2]  Michael Raupach,et al.  Half-cell potential measurements—Potential mapping on reinforced concrete structures , 2003 .

[3]  R. F. Stratfull.  Progress Report on Inhibiting the Corrosion of Steel In a Reinforced Concrete Bridge , 1959 .

[4]  J P Broomfield,et al.  CATHODIC PROTECTION OF REINFORCED CONCRETE BRIDGE COMPONENTS , 1993 .

[5]  R. Polder,et al.  Early stage beneficial effects of cathodic protection in concrete structures , 2011 .

[6]  Chris I. Goodier,et al.  Assessing the long term benefits of Impressed Current Cathodic Protection , 2010 .

[7]  G. Glass,et al.  A method of ranking the aggressive nature of chloride contaminated concrete , 2000 .

[8]  Antje Strauss,et al.  Corrosion Of Steel In Concrete Understanding Investigation And Repair , 2016 .

[9]  G. Glass,et al.  The presentation of the chloride threshold level for corrosion of steel in concrete , 1997 .

[10]  C Christodoulu,et al.  Corrosion management of concrete structures , 2009 .

[11]  Ueli Angst,et al.  Critical Chloride Content in Reinforced Concrete: A Review , 2009 .

[12]  L. H. Everett,et al.  DETERIORATION DUE TO CORROSION IN REINFORCED CONCRETE , 1980 .

[13]  R. F. Stratfull.  The Corrosion of Steel In a Reinforced Concrete Bridge , 1957 .

[14]  C. Goodier,et al.  On-site transient analysis for the corrosion assessment of reinforced concrete , 2012 .

[15]  G. Glass,et al.  Corrosion inhibition in concrete arising from its acid neutralisation capacity , 2000 .

[16]  A. Sagüés,et al.  Steel Activation in Concrete Following Interruption of Long-Term Cathodic Polarization , 2005 .

[17]  J. Broomfield.  A Case History of Cathodic Protection of a Highway Structure in the UK , 2004 .