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Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete
In this paper, probable corrosion mechanisms of hot-dip galvanised reinforcement bar in cracked concrete based on long-term durability tests and other studies are determined. The study presents long-term laboratory study with two concrete and four reinforcement bar types: ordinary steel, hot-dip galvanized ordinary steel, wheatering steel (TENCOR) and austenitic stainless steel (AISI 304). The fist mechanism consists of a local dissolution of eta and zeta phase. In the second mechanism due to non-uniform zinc coating local dissolution of eta and zeta phase together with longitudinal and perpendicular cracking in zinc layer may lead to separation of zinc layer. In the third mechanism due to non-uniform zinc coating full dissolution of eta and partial dissolution of zeta phase together with longitudinal and perpendicular cracking in ferrite may lead to separation of zinc layer and ferrite. Corrosion rate with used cement type was decreasing. That is not dependent on concrete quality. However, concrete type has an effect on corrosion rate and moisture conditions. The rate of corrosion was determined by the electrochemical measurements complied with SEM studies and proposed corrosion mechanisms.
Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete
In this paper, probable corrosion mechanisms of hot-dip galvanised reinforcement bar in cracked concrete based on long-term durability tests and other studies are determined. The study presents long-term laboratory study with two concrete and four reinforcement bar types: ordinary steel, hot-dip galvanized ordinary steel, wheatering steel (TENCOR) and austenitic stainless steel (AISI 304). The fist mechanism consists of a local dissolution of eta and zeta phase. In the second mechanism due to non-uniform zinc coating local dissolution of eta and zeta phase together with longitudinal and perpendicular cracking in zinc layer may lead to separation of zinc layer. In the third mechanism due to non-uniform zinc coating full dissolution of eta and partial dissolution of zeta phase together with longitudinal and perpendicular cracking in ferrite may lead to separation of zinc layer and ferrite. Corrosion rate with used cement type was decreasing. That is not dependent on concrete quality. However, concrete type has an effect on corrosion rate and moisture conditions. The rate of corrosion was determined by the electrochemical measurements complied with SEM studies and proposed corrosion mechanisms.
Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete
Korrosionsmechanismus einer feuerverzinkten Bewehrung in rissigem Beton
Sistonen, E. (author) / Cwirzen, A. (author) / Puttonen, J. (author)
Corrosion Science ; 50 ; 3416-3428
2008
13 Seiten, 17 Bilder, 14 Tabellen, 29 Quellen
Article (Journal)
English
Korrosionsmechanismus , Lochkorrosion , Bewehrungsstahl , Vergleichsuntersuchung , verzinkter Stahl , Feuerverzinken , austenitischer nichtrostender Stahl , witterungsbeständiger Stahl , unlegierter Stahl , Beton , Zement , Rissigkeit , Langzeitprüfung , Laborversuch , Phasenzusammensetzung , Korrosionsgeschwindigkeit , Korrosionspotenzial , Brauchwasser , Natriumchlorid , Rasterelektronenmikroskopie , Chrom-Nickel-Stahl
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