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Twelve-year laboratory tests of rebar reinforced concrete beams partially submerged in artificial seawater have confirmed that steel corrosion may occur a few months after immersion and may continue for many years.
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Results of laboratory tests of dual-coated (zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies.
Steel rebar in concrete is in a passive state due to the high pH of concrete. The hydroxyl (OH-) ions in highly alkaline concrete pore solution act as inhibitors and promote passive film stability, while chloride ions lead to passive film breakdown. Leckie and Uhlig1 first explained the counter effect of inhibitor action with chloride concentration. They proposed a competition between the inhibitor and chloride anions for adsorption on the passive surface.
New for 2018! This NACE International state-of-the-art report contains information about materials that provide a corrosion-resistant alternative to plain carbon steel reinforcing bar (rebar). The report is intended for use by engineers when considering the use of alternative concrete reinforcement and post- or prestressing strand materials with higher corrosion resistance than that of conventional carbon steel alloys.
HISTORICAL DOCUMENT. Procedures to control corrosion of conventional reinforcing steel in Portland cement concrete structures through the application of chloride extraction or realkalization.
HISTORICAL DOCUMENT. Ordering, cleaning, coating, inspecting, handling, transporting & installing steel reinforcing bars. Fusion-bonded epoxy powder coatings by electrostatic spray. For owners, architects, engineers & contractors.
Testing and investigative procedures for evaluation of conventionally reinforced concrete structures. Focus on degradation from corrosion of reinforcing steel.
DOWNLOADABLE HISTORICAL DOCUMENT Maintenance of reinforced-concrete structures (site survey, structural survey, repair options) and corrosion-control techniques. Sources of additional information, bibliographic information, definitions.