By Paul M. Chess, John P. Broomfield
Cathodic security of metal in Concrete presents the main finished precis of the electrochemical recommendations for treating metal corrosion to this point. It comprises an exam of the explanations of corrosion and its accelerating price and describes overview equipment.
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Additional resources for Cathodic Protection of Steel in Concrete
Normally, a few years after a CP system is energized the current demand required to prevent corrosion of the reinforced steel is significantly reduced. At this point the current density the system is delivering should be lowered by reducing the driving voltage. The most suitable cables for use in concrete CP installations are doubleinsulated with a hard and abrasion resistant sheath.
The structural assessment should assess the effect of any loss of reinforcement cross-section in addition to that of concrete section. However, the full extent of the actual loss is very rarely known, particularly when pitting corrosion, occurring as a result of chloride contamination, can cause a significant loss of section with little visual evidence. Consequently, where pitting corrosion is suspected, it would be necessary to expose the reinforcement and to assess the extent, if any, of the pitting corrosion and the resulted loss of steel cross-section.
1(b)) (Clear, 1975). 1(b)). Source: after Pullar-Strecker (1987). 5 Carbonation depth measurements The depth and extent of carbonation should be assessed either on site or in the laboratory using the technique described in BRE Information Paper IP-6/81 (1981). Phenolphthalein is used as an indicator to determine the depth of carbonation on freshly fractured or drilled concrete surfaces. 1(b) Chloride content decreases with depth into the surface: proposed threshold limits for corrosion, due to the ingress of chloride ions Source: after Clear (1995).