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Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part I: Potential measurements
The paper reports on long-time testing of reinforcement corrosion in normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Potential monitoring evidenced a passive condition for all reinforcements embedded in normalweight concretes. The initiation of the corrosive attack in total-lightweight concretes could not be evidenced, although low potential values were found on corroding reinforcements. Free corrosion potential of reinforcement exhibited a variability related to the type of concrete and the exposure conditions. The variations induced by environmental changes were particularly evident in total-lightweight concretes. Consequently, potential mesurements could not be analysed according to ASTM C 786-87 criteria. Interpretation criteria more appropriate to the specific situation were assessed by statistical analysis of potential values. Fully passive conditions were outlined for all reinforcements in the normalweight concretes in five years testing. Nevertheless, potential monitoring could not give any evidence of corrosion initiation on reinforcement embedded in total-lightweight concrete, owing to the overlapping of activity and passivity range and the wide variability induced by environmental exposure (to be continued).
Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part I: Potential measurements
The paper reports on long-time testing of reinforcement corrosion in normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Potential monitoring evidenced a passive condition for all reinforcements embedded in normalweight concretes. The initiation of the corrosive attack in total-lightweight concretes could not be evidenced, although low potential values were found on corroding reinforcements. Free corrosion potential of reinforcement exhibited a variability related to the type of concrete and the exposure conditions. The variations induced by environmental changes were particularly evident in total-lightweight concretes. Consequently, potential mesurements could not be analysed according to ASTM C 786-87 criteria. Interpretation criteria more appropriate to the specific situation were assessed by statistical analysis of potential values. Fully passive conditions were outlined for all reinforcements in the normalweight concretes in five years testing. Nevertheless, potential monitoring could not give any evidence of corrosion initiation on reinforcement embedded in total-lightweight concrete, owing to the overlapping of activity and passivity range and the wide variability induced by environmental exposure (to be continued).
Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part I: Potential measurements
Überwachung der Stahlkorrosion von Normal- und Leichtbeton bei Angriff durch Chlorid- und Sulfatlösungen. Teil 1: Potentialmessungen
Baronio, G. (author) / Berra, M. (author) / Bertolini, L. (author) / Pastore, T. (author)
Cement and Concrete Research ; 26 ; 683-689
1996
7 Seiten, 6 Bilder, 1 Tabelle, 4 Quellen
Article (Journal)
English
| British Library Online Contents | 1996
| British Library Online Contents | 1996