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Chloride threshold for rebar corrosion in concrete with addition of silica fume
The effect of silica fume on the chloride threshold for the initiation of pitting corrosion of steel in concrete was investigated. Laboratory tests were carried out in concrete specimens made with ordinary Portland cement and with 10% of silica fume. Chloride contents up to 2% by mass of cement were added to the mixes, in order to investigate the corrosion rate of embedded bars made of both strengthened and mild steel. A lower chloride threshold was observed in the bars which were embedded in concrete with silica fume compared to those embedded in concrete made of Portland cement. Such critical value was 1.1-2% by mass cement of Portland cement concrete and 0.6-1.2% by mass binder for concrete with 10% of silica fume. As far as the corrosion behaviour in chloride contaminated concrete is concerned, no significant differences were observed between smooth bars of mild steel and ribbed bars of Tempcore steel. A slight influence of the surface finishing was observed. In chloride contaminated concrete, bars in the as-received condition, i. e. coated by a mill scale, showed higher corrosion rates than sand-blasted bars.
Chloride threshold for rebar corrosion in concrete with addition of silica fume
The effect of silica fume on the chloride threshold for the initiation of pitting corrosion of steel in concrete was investigated. Laboratory tests were carried out in concrete specimens made with ordinary Portland cement and with 10% of silica fume. Chloride contents up to 2% by mass of cement were added to the mixes, in order to investigate the corrosion rate of embedded bars made of both strengthened and mild steel. A lower chloride threshold was observed in the bars which were embedded in concrete with silica fume compared to those embedded in concrete made of Portland cement. Such critical value was 1.1-2% by mass cement of Portland cement concrete and 0.6-1.2% by mass binder for concrete with 10% of silica fume. As far as the corrosion behaviour in chloride contaminated concrete is concerned, no significant differences were observed between smooth bars of mild steel and ribbed bars of Tempcore steel. A slight influence of the surface finishing was observed. In chloride contaminated concrete, bars in the as-received condition, i. e. coated by a mill scale, showed higher corrosion rates than sand-blasted bars.
Chloride threshold for rebar corrosion in concrete with addition of silica fume
Chlorid-Grenzwert für die Stahlbewehrungskorrosion in Beton mit Siliciumdioxidstaub
Manera, Marco (Autor:in) / Vennesland, Oystein (Autor:in) / Bertolini, Luca (Autor:in)
Corrosion Science ; 50 ; 554-560
2008
7 Seiten, 9 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
Chloride threshold for rebar corrosion in concrete with addition of silica fume
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