Title:
Patch Repair and Macrocell Activity in Concrete Structures
Author(s):
Franz Pruckner and Odd E. Gjørv
Publication:
Materials Journal
Volume:
99
Issue:
2
Appears on pages(s):
143-148
Keywords:
concrete; corrosion; repair.
DOI:
10.14359/11706
Date:
3/1/2002
Abstract:
For many years, electrochemical potential mapping has been the most commonly used technique for assessment of steel corrosion in concrete structures. Since the electrochemical potentials are affected by a number of factors, however, a proper interpretation of potential mapping requires much experience. In the present paper, it is shown how a combination of the potential mapping with electrical resistance mapping can reduce both difficulties and uncertainties in the interpretation of potential mapping. By combining so-called net potential differences with concrete resistivities and depths of concrete cover, corrosion activity maps can be produced to visualize the effect of patch repairs on the macrocell activity of localized corrosion on embedded steel. In addition to providing a very good image for assessment of localized corrosion, it is also shown how the severeness of corrosion can be expressed by histograms based on all of the single measurements of galvanic activity.