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Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part II: Polarisation resistance measurements
The paper reports on long time testing of reinforcement corrosion in high strength normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Polarisation resistance monitoring performed for evaluation corrosion rates confirmed passive condition for all reinforcements embedded in normalweight concretes. The initiation of the corrosive attack was detected in all the reinforcements in total-lightweight concretes. The utilisation of lightweight agregate both for fine and coarse aggregate instead of normal density aggregate brought about a reduction of protective properties of concrete with regard to reinforcement corrosion, owing to a greater porosity and, thus, to a higher absorption of aggressive solutions. As far as total-lightweight concretes utilised in this work are concerned, a similar behaviour was observed regardless of the specific mix design, although an early initiation of corrosion occured on reinforcement in total-lightweight concretes with the highest binder content. The evaluation of corrosion rate by means of polarisation resistance measurements pointed out the evolution of corrosion on reinforcements giving in all cases a clear interpretation even where potential monitoring was ambiguous, that is on total-lightweight concrete specimens. Corrosion rate of reinforcements in total-lightweight concrete was higher compared to reinforcements in normalweight concrete even during the first period, in passive condition. After corrosion initiated owing to chloride ions penetration, corrosion rate increased to values up to 25 microns/year to 400 microns/year.
Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part II: Polarisation resistance measurements
The paper reports on long time testing of reinforcement corrosion in high strength normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Polarisation resistance monitoring performed for evaluation corrosion rates confirmed passive condition for all reinforcements embedded in normalweight concretes. The initiation of the corrosive attack was detected in all the reinforcements in total-lightweight concretes. The utilisation of lightweight agregate both for fine and coarse aggregate instead of normal density aggregate brought about a reduction of protective properties of concrete with regard to reinforcement corrosion, owing to a greater porosity and, thus, to a higher absorption of aggressive solutions. As far as total-lightweight concretes utilised in this work are concerned, a similar behaviour was observed regardless of the specific mix design, although an early initiation of corrosion occured on reinforcement in total-lightweight concretes with the highest binder content. The evaluation of corrosion rate by means of polarisation resistance measurements pointed out the evolution of corrosion on reinforcements giving in all cases a clear interpretation even where potential monitoring was ambiguous, that is on total-lightweight concrete specimens. Corrosion rate of reinforcements in total-lightweight concrete was higher compared to reinforcements in normalweight concrete even during the first period, in passive condition. After corrosion initiated owing to chloride ions penetration, corrosion rate increased to values up to 25 microns/year to 400 microns/year.
Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions. Part II: Polarisation resistance measurements
Überwachung der Stahlkorrosion von Normal- und Leichtbeton bei Angriff durch Chlorid- und Sulfatlösungen. Teil 2: Bestimmung des Polarisationswiderstands
Baronio, G. (author) / Berra, M. (author) / Bertolini, L. (author) / Pastore, T. (author)
Cement and Concrete Research ; 26 ; 691-696
1996
6 Seiten, 6 Bilder, 1 Tabelle, 5 Quellen
Article (Journal)
English
| British Library Online Contents | 1996
| British Library Online Contents | 1996