Ten-year field evaluation of corrosion-inhibiting systems in concrete bridges barrier walls

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Journal titleACI Materials Journal
Pages291300; # of pages: 10
Subjectbridge deck, chloride ingress, corrosion-inhibiting systems; cracking; durability; environmental conditions; field investigation; high-performance concrete; steel corrosion; Corrosion/cracking
AbstractThe performance of eight commercial corrosion-inhibiting systems was assessed in the field over ten years on reinforced concrete barrier walls of a highway bridge that was subjected to severe environmental conditions. These systems were composed of one or more of the following components: anticorrosion concrete admixtures, reinforcement coatings, and concrete surface coatings/sealers. The field evaluation consisted of annual surveys of corrosion potential and corrosion rate, as well as visual inspections and testing of concrete cores. After ten years, the main reinforcement of the barrier walls, at a depth of 75 mm [3 in.], was found in relatively good condition due to an initially good quality concrete. Special bars embedded at a depth of 13 mm [1/2 in.] in the barrier walls showed signs of advanced corrosion for all systems, however, no visible signs of corrosion were found on 25 mm [1 in.] deep bars. Non-destructive corrosion evaluation over the 25 mm [1 in.] deep ladder rebars indicated that the system containing the inorganic anticorrosion admixture provided consistently lower risks of corrosion, followed by systems containing organic anticorrosion admixtures, in comparison to the control system and other systems. The low concrete permeability and different stability of the protective layer forming on the bars may explain the observed differences in the effectiveness of these systems.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number50550
NPARC number20378260
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Record identifierca9c0587-07d3-441f-a56f-0e8f96ca09bf
Record created2012-07-24
Record modified2016-05-09
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