Instant and solid corrosion diagnosis on reinforced concrete structures with galvanostatic pulse measurement

摘要

The potential survey has established itself as the major NDT measurement for the assessment of rebar corrosion on concrete structures. Although it is easy to obtain the data, its correct interpretation is difficult and sometimes impossible, as the intended indicators for corrosion will be overlaid by varying concrete humidity, concrete cover and concrete composition to an unknown extent. Very often, a correlation with chloride values sampled from suspect areas will not result in a feasible pattern for the evaluation of the corrosion activity. With the help of enhanced corrosion measurement methods, such as impedance- and galvanostatic pulse measurements, these uncertainties can be eliminated safely in most cases. Furthermore, also carbonation induced corrosion -where potential mapping provides no access basically - can be evaluated securely.