Effectiveness of Commercial Corrosion Inhibitors for Reinforced Concrete

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Title: Effectiveness of Commercial Corrosion Inhibitors for Reinforced Concrete

Author(s): F. Bolzoni, S. Goidanich, M. Ormellese, M.P. Pedeferri, and A. Lolli

Publication: Special Publication

Volume: 239

Issue:

Appears on pages(s): 249-268

Keywords: carbonation; chloride-induced corrosion; concrete; corrosion inhibitors; corrosion rate; critical chloride threshold

Date: 10/1/2006

Abstract:
This paper presents five years of data on the effectiveness of six commercial corrosion inhibitors: four admixed and two migrating. Both chloride and carbonation induced corrosion were considered, and the performance of the inhibitors was evaluated by long–term rebar corrosion monitoring, chloride profiles and carbonation depth. In chloride containing concrete, inhibitors seems to increase time-to-corrosion: this is mainly related to a reduction of chloride penetration rather than a significant increase in critical chloride threshold for corrosion initiation. The inhibitors had negligible effect on carbonation rate; once corrosion occurred, they were not effective in reducing corrosion rate. Migrating inhibitors delayed initiation of chloride-induce corrosion if applied before corrosion initiation. No effect was observed on corrosion rate.