Mechanical properties and corrosion mechanism of steel fiber reinforced concrete (SFRC) subjected to stray current

The application of steel fiber reinforced concrete (SFRC) in electric railways shows an obvious advantage due to its excellent mechanical properties. However, stray current induced corrosion is a potential threat to SFRC. In this study, the mechanical properties evolution of SFRC suffered from the action of stray current was investigated, including the compressive strength, flexural and splitting-tensile properties. Meanwhile, the effects of water to cement ratio (W/C), fly ash and slag on the corrosion resistance of SFRC were considered. Moreover, the corrosion mechanism of SFRC subjected to stray current was analyzed. It was found that the mechanical properties of SFRC degraded gradually under the action of stray current, since two electrolytic-cell reactions took place in the corrosion process. However, the addition of fly ash and slag can greatly improve its resistance to the attack of stray current, this makes it possible to the application of SFRC in electric railways.