Abstract
In the current study, the effects of chloride-induced corrosion on B500c semi-embedded steel bars, both immersed in a salt-spray chamber and on protruding areas of existing structures, are evaluated in terms of mass loss and mechanical characteristics. Comparison of corrosion damage rates between bare and semi-embedded specimens at the early stages of the corrosion test, indicates that the bare steel bars present quite high mass losses, which however, over exposure time reach approximately similar rates to the ones presented by the semi-embedded steel bars. As far as mechanical characteristics are concerned, the mass loss of semi-embedded steel rebars, at the protruding site, is related to the strength and ductility properties drop. At the same time, while the corrosion exposure time is increasing in bare samples, a continuous-almost linear and proportional to the mass loss-reduction of the strength properties and the uniform elongation is observed. Finally, a worth referring point is the appearance of two Ludder areas on stress-strain diagrams of semi-embedded steel bars, a point that confirms the different corrosion mechanism of protruding areas in comparison to the bare or the wholly embedded ones.
Highlights
As it is widely known, the protruding rebar consist steel bars emerging from the structural components intended for future use and for further extension of the frames of reinforced concrete structures
To control the degradation of semi –embedded steel bars after the laboratory corrosion, mass loss was measured for both groups of rebar
Mass loss measurements were taken from protruding area of B500c dual phase rebar after natural and laboratory accelerated corrosion due to chloride ions
Summary
As it is widely known, the protruding rebar consist steel bars emerging from the structural components (columns and beams) intended for future use and for further extension of the frames of reinforced concrete structures. In certain Mediterranean countries, such as Greece or Turkey, it is quite often for the protruding rebar to be left without any protection This fact, often raises speculations concerning the structural integrity of steel, mainly due to the corrosive environmental action. The contact of free concrete surface with the atmospheric pollution, as well as the given penetration of the water into the concrete , makes region B complex. This complexity is directly related to the interaction between chemical and electrochemical corrosion or just with corrosion using atmosphere and polluting deposits as electrolytes or even concrete. A quite important percentage of steel corrosion (region Β), may happens due to microbiological induced corrosion (MIC) [3,4], derived from the animal (exudates of microorganisms) and the natural environment (aureobasidium pullulans-cladosporium cladosporioides -alternaria alternata etc)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
