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Corrosion assessment of reinforced concrete structures in corrosive environments in Chinese chemical industry
Techniques have been assessed for estimating corrosion in reinforced concrete structures in chemical environments, and measurements have been carried out in the laboratory at the University of Liverpool and at several different chemical factory sites in China and the UK. If it is possible to make a direct contact to the steel reinforcement, then linear polarisation resistance (LPR) measurement is the most suitable technique to employ. Moving an auxiliary/reference electrode probe along the concrete surface and taking repeated measurements on the same reinforcing bar at different distances away from it, using ac impedance and galvanostatic pulse techniques, has related the corrosion processes at the reinforcement bar surface to the 1 kHz to 0.1 kHz frequency region. This essentially corresponds to using LPR to 0.1 kHz from the dc resistance value. Instruments of this kind are available in practice. Where it is not possible to make contact with the reinforcement bar, it has been found that concrete resistivity measurement is a better technique in chemical environments for estimating corrosion than potential measurement or mapping. If possible, the 4-contact Wenner resistivity technique should be employed. Instruments of this type suitable for use on concrete are commercially available. However, if such a specialised instrument is not available, then resistance measurement using a multimeter between two copper/copper sulphate reference electrodes (each of contact area 200 mm2) placed on the concrete surface 100 mm apart has been found to give a resistance measurement in ohms approximately 1/10 of the concrete resistivity in Ohmm.
Corrosion assessment of reinforced concrete structures in corrosive environments in Chinese chemical industry
Techniques have been assessed for estimating corrosion in reinforced concrete structures in chemical environments, and measurements have been carried out in the laboratory at the University of Liverpool and at several different chemical factory sites in China and the UK. If it is possible to make a direct contact to the steel reinforcement, then linear polarisation resistance (LPR) measurement is the most suitable technique to employ. Moving an auxiliary/reference electrode probe along the concrete surface and taking repeated measurements on the same reinforcing bar at different distances away from it, using ac impedance and galvanostatic pulse techniques, has related the corrosion processes at the reinforcement bar surface to the 1 kHz to 0.1 kHz frequency region. This essentially corresponds to using LPR to 0.1 kHz from the dc resistance value. Instruments of this kind are available in practice. Where it is not possible to make contact with the reinforcement bar, it has been found that concrete resistivity measurement is a better technique in chemical environments for estimating corrosion than potential measurement or mapping. If possible, the 4-contact Wenner resistivity technique should be employed. Instruments of this type suitable for use on concrete are commercially available. However, if such a specialised instrument is not available, then resistance measurement using a multimeter between two copper/copper sulphate reference electrodes (each of contact area 200 mm2) placed on the concrete surface 100 mm apart has been found to give a resistance measurement in ohms approximately 1/10 of the concrete resistivity in Ohmm.
Corrosion assessment of reinforced concrete structures in corrosive environments in Chinese chemical industry
Bewertung der Korrosion von Stahlbetonkonstruktionen in korrosiver Umgebung der chemischen Industrie Chinas
Huo Da (author) / Growers, K.R. (author) / Wang, Dongwei (author) / Li, Dawang (author) / Millard, S.G. (author) / Zhuo, Z.H. (author)
British Corrosion Journal ; 36 ; 70-74
2001
5 Seiten, 6 Bilder, 4 Tabellen, 12 Quellen
Article (Journal)
English
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