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A platform for research: civil engineering, architecture and urbanism
Stray current induced corrosion of steel fibre reinforced concrete
AbstractStray current induced corrosion is a major technical challenge for modern electric railway systems. The leakage of stray current to surrounding reinforced concrete structures can lead to steel reinforcement corrosion and the subsequent disintegration of concrete. Steel fibre reinforced concrete has been increasingly used as the railway tunnel lining material but it is not clear if discrete steel fibres can still pick up and transfer stray current in the same way as conventional steel reinforcement and lead to similar corrosion reactions. The corrosion behaviour of steel fibres was investigated through voltammetry tests and electrochemical impedance spectroscopy. The presence of high concentration chloride ions was found to increase the pitting corrosion tendency of steel fibres in simulated concrete pore solutions and mortar specimens. The chloride threshold level for corrosion of steel fibres in concrete is approximately 4% NaCl (by mass of cement) which is significantly higher than that of conventional steel reinforcement.
HighlightsFormation of stray-current and its effect on the corrosion behaviour of conventional steel reinforced concrete;The use of simulated concrete pore solutions to investigate the corrosion behaviour of steel fibre reinforced concrete;The pitting tendency of steel fibres in steel fibre reinforced concrete (SFRC).
Stray current induced corrosion of steel fibre reinforced concrete
AbstractStray current induced corrosion is a major technical challenge for modern electric railway systems. The leakage of stray current to surrounding reinforced concrete structures can lead to steel reinforcement corrosion and the subsequent disintegration of concrete. Steel fibre reinforced concrete has been increasingly used as the railway tunnel lining material but it is not clear if discrete steel fibres can still pick up and transfer stray current in the same way as conventional steel reinforcement and lead to similar corrosion reactions. The corrosion behaviour of steel fibres was investigated through voltammetry tests and electrochemical impedance spectroscopy. The presence of high concentration chloride ions was found to increase the pitting corrosion tendency of steel fibres in simulated concrete pore solutions and mortar specimens. The chloride threshold level for corrosion of steel fibres in concrete is approximately 4% NaCl (by mass of cement) which is significantly higher than that of conventional steel reinforcement.
HighlightsFormation of stray-current and its effect on the corrosion behaviour of conventional steel reinforced concrete;The use of simulated concrete pore solutions to investigate the corrosion behaviour of steel fibre reinforced concrete;The pitting tendency of steel fibres in steel fibre reinforced concrete (SFRC).
Stray current induced corrosion of steel fibre reinforced concrete
Tang, Kangkang (author)
Cement and Concrete Research ; 100 ; 445-456
2017-08-03
12 pages
Article (Journal)
Electronic Resource
English
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