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Migrating corrosion inhibitors for reinforced concrete
Year after year reinforcing steel corrodes in reinforced concrete structures, resulting in spalling and reduction of structural capacity. The major casual factors are a combination of chloride ingress, sulfate attack, corrosion of reinforcement steel, and environmental cracking. This paper discusses the use of organic Migrating Corrosion Inhibitors (MCI) to protect steel reinforced concrete against corrosion. A variety of tests are performed to investigate the effectiveness of these inhibitors, including 5 year test measurements of the rebar in a bridge deck which is overlaid with a concrete/MCI mix. Two tests are made to confirm the migratory nature of these inhibitors: a test using selective electrode techniques to determine diffusion rates; and radioactive tagging of inhibitor molecules with Tritium, which traced movement of the inhibitor through concrete versus time. Tests to evaluate the effect of these inhibitors on physical and chemical properties of concrete mixes included: ASTM C666 (freeze-thaw), ASTM C109 (compressive), and ASTM C192, C231 (entrained air content). The results show that Migrating Corrosion Inhibitors provide corrosion protection to rebar in chloride contaminated concrete without any adverse effect on the structure. This method is non-destructive and environmentally friendly.
Migrating corrosion inhibitors for reinforced concrete
Year after year reinforcing steel corrodes in reinforced concrete structures, resulting in spalling and reduction of structural capacity. The major casual factors are a combination of chloride ingress, sulfate attack, corrosion of reinforcement steel, and environmental cracking. This paper discusses the use of organic Migrating Corrosion Inhibitors (MCI) to protect steel reinforced concrete against corrosion. A variety of tests are performed to investigate the effectiveness of these inhibitors, including 5 year test measurements of the rebar in a bridge deck which is overlaid with a concrete/MCI mix. Two tests are made to confirm the migratory nature of these inhibitors: a test using selective electrode techniques to determine diffusion rates; and radioactive tagging of inhibitor molecules with Tritium, which traced movement of the inhibitor through concrete versus time. Tests to evaluate the effect of these inhibitors on physical and chemical properties of concrete mixes included: ASTM C666 (freeze-thaw), ASTM C109 (compressive), and ASTM C192, C231 (entrained air content). The results show that Migrating Corrosion Inhibitors provide corrosion protection to rebar in chloride contaminated concrete without any adverse effect on the structure. This method is non-destructive and environmentally friendly.
Migrating corrosion inhibitors for reinforced concrete
Migrierende Korrosionsinhibitoren für Stahlbeton
Miksic, B. (author) / Gelner, L. (author) / Bjegovic, D. (author) / Sipos, L. (author)
1995
20 Seiten, 6 Bilder, 12 Tabellen, 22 Quellen
Conference paper
English
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