By Paul M. Chess, John P. Broomfield
Cathodic security of metal in Concrete presents the main finished precis of the electrochemical ideas for treating metal corrosion to this point. It includes an exam of the reasons of corrosion and its accelerating cost and describes review equipment.
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The changes in potentials over the trial area can then be calculated. This will demonstrate that all areas are now net cathodes and that particular potential criteria, notably potential ‘shift’, are being met. It is most satisfactory to run the trial initially at the ‘best-guess’ current level considered necessary for protection and make changes in the current level as required before leaving the system for a protracted period (at least a week) at the same output. Unfortunately this ideal is frequently impractical and valuable information on the SYSTEM DESIGN 43 Fig.
Thus allowance should be made for protecting at least two and a half times the area of the innermost steel layer, in order to provide sufficient current density for the protection of the most at risk (the inner layer) steel. It should be evident from these examples that it is difficult to generalize on the current distribution in real structures. It is thus recommended, particularly when the structure is different to those which have been protected previously, that a trial is undertaken during the CP design survey to enable an assessment of current distribution.
In many cases this method can be relatively expensive and would be impractical in structures with cast-in chlorides. g. the reinforcement is so badly corroded that it cannot be satisfactorily reinstated), or where deterioration is so extensive that repair becomes very expensive, then replacement of the element may be a cost-effective option. This is likely, however, to entail temporary support to the structure and is likely to require considerable design input to ensure that the temporary support is technically and practically feasible.