Performance indicators and specifications for fusion-bonded-epoxy(FBE)-coated steel rebars in concrete exposed to chlorides
22 Jan 2021-pp 1-19
TL;DR: Fusion-bonded-epoxy (FBE)-coated steel rebars have been used in many concrete structures in anticipation of better corrosion resistance as discussed by the authors, however, due to premature corrosion observed, FBE-coated rebars are not suitable for concrete structures.
Abstract: Fusion-bonded-epoxy (FBE)-coated steel rebars have been used in many concrete structures in anticipation of better corrosion resistance. However, due to premature corrosion observed, FBE-coated reb...
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TL;DR: In this article, the suitability of various techniques such as halfcell potential, macrocell corrosion, linear polarization resistance, and electrochemical impedance spectroscopy (EIS) to detect corrosion initiation of fusion-bonded-epoxy (FBE) coated steel rebars in concrete was evaluated.
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References
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TL;DR: In this paper, a review of the state-of-the-art in the area of critical chloride thresholding of reinforced concrete is presented, highlighting the strong need for a practice-related test method, and focusing especially on experimental procedures.
982 citations
TL;DR: In this article, homogeneous epoxy coatings containing nanoparticles of SiO 2, Zn, Fe 2 O 3 and halloysite clay were successfully synthesized on steel substrates by room-temperature curing of a fully mixed epoxy slurry diluted by acetone.
Abstract: Homogeneous epoxy coatings containing nanoparticles of SiO 2 , Zn, Fe 2 O 3 and halloysite clay were successfully synthesized on steel substrates by room-temperature curing of a fully mixed epoxy slurry diluted by acetone. The surface morphology and mechanical properties of these coatings were characterized by scanning electron microscopy and atomic force microscopy, respectively. The effect of incorporating various nanoparticles on the corrosion resistance of epoxy-coated steel was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The electrochemical monitoring of the coated steel over 28 days of immersion in both 0.3 wt.% and 3 wt.% NaCl solutions suggested the beneficial role of nanoparticles in significantly improving the corrosion resistance of the coated steel, with the Fe 2 O 3 and halloysite clay nanoparticles being the best. The SiO 2 nanoparticles were found to significantly improve the microstructure of the coating matrix and thus enhanced both the anticorrosive performance and Young's modulus of the epoxy coating. In addition to enhancing the coating barrier performance, at least another mechanism was at work to account for the role of the nanoparticles in improving the anticorrosive performance of these epoxy coatings.
566 citations
TL;DR: In this paper, the authors assessed the nature of sorbed water and the related hygrothermal effects in epoxy resins and found that water molecules bind with epoxy resin through hydrogen bonding.
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TL;DR: The application of electrochemical techniques for corrosion studies of organic coatings on reactive metals is considered from the analytical and mechanistic standpoint in this paper, where three techniques such as electrochemical impedance spectroscopy (EIS), scanning vibrating electrode and scanning Kelvinprobe (SKP) are used to better understand the fundamental processes of corrosion at defects and underneath coatings.
507 citations
TL;DR: In this paper, the state of the art on the CTL for steel corrosion in concrete, concerning its measurement, representation, influencing factors and methods to enhance the threshold level (CTL).
472 citations