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Multi-linear-reference-electrode for localized corrosion monitoring of reinforced prestressed concrete structures
Failures of pre-stressing and post-tensioning steel caused by hydrogen embrittlement as a consequence of chloride-induced corrosion are well known in the civil engineering field. In order to monitor the occurrence of localized corrosion in concrete structures (viaduct, prestressed concrete cylinder pipes, pre-stressed and post-tensioned structures), the use of a Linear-Continuous-Reference-Electrode (LCRE) has been proposed, claiming that, once a pit starts in any position on the pre-stressed steel, the potential lowers to values typical of active range, giving promptly the evidence of pitting initiation. Since concerns arise about the effectiveness of this system, a multi-reference electrode (MuRE) was proposed and studied, consisting of a series of continuous metallic wires able to measure the potential of carbon steel rebars and tendons. In 2007, four MuRE prototypes were installed on pre-stressed concrete beams; results of potential monitoring performed during the first year are reported. The MuRE system is able to localize the onset of chloride-induced corrosion; the potential reading is interpreted as the average potential weighted on the crossed equipotential surfaces.
Multi-linear-reference-electrode for localized corrosion monitoring of reinforced prestressed concrete structures
Failures of pre-stressing and post-tensioning steel caused by hydrogen embrittlement as a consequence of chloride-induced corrosion are well known in the civil engineering field. In order to monitor the occurrence of localized corrosion in concrete structures (viaduct, prestressed concrete cylinder pipes, pre-stressed and post-tensioned structures), the use of a Linear-Continuous-Reference-Electrode (LCRE) has been proposed, claiming that, once a pit starts in any position on the pre-stressed steel, the potential lowers to values typical of active range, giving promptly the evidence of pitting initiation. Since concerns arise about the effectiveness of this system, a multi-reference electrode (MuRE) was proposed and studied, consisting of a series of continuous metallic wires able to measure the potential of carbon steel rebars and tendons. In 2007, four MuRE prototypes were installed on pre-stressed concrete beams; results of potential monitoring performed during the first year are reported. The MuRE system is able to localize the onset of chloride-induced corrosion; the potential reading is interpreted as the average potential weighted on the crossed equipotential surfaces.
Multi-linear-reference-electrode for localized corrosion monitoring of reinforced prestressed concrete structures
Multilineare Referenzelektrode zur lokalen Korrosionsüberwachung von vorgespannten Stahlbetonbauten
Ormellese, Marco (author) / Lazzari, Luciano (author) / Pedeferri, Pietro (author) / Bazzoni, Bruno (author)
2009
6 Seiten, 4 Bilder, 1 Tabelle, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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