A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Corrosion Evaluation of Bridges with Epoxy-Coated Rebar
Epoxy coated steel reinforcement (ECR) was used for corrosion control in FDOT marine reinforced concrete bridges from the late 1970's up to the early 1990's. However, severe ECR corrosion developed in some Florida Keys Bridges. Investigations completed in 1993 showed that those structures had concrete with high permeability. Early models projected corrosion development of other FDOT ECR structures with moderate concrete permeability after one more decade or so, and lesser likelihood of observing corrosion at that in other bridges with lower concrete permeability. The investigation examined the present corrosion condition of 13 ECR structures to validate and refine those earlier projections. Damage was found to have progressed steadily in the bridges showing early corrosion. Externally recognizable ECR corrosion damage was found, as expected, in other bridges with intermediate concrete permeability. No severe ECR corrosion developed when the coated bar was protected by a thick cover of sound, very low permeability concrete as encountered in very low concrete permeability bridges. However, there was widespread disbondment of the epoxy coating in all these structures even in sound concrete locations. This disbondment together with observed frequent coating breaks are expected to facilitate corrosion initiation as chloride levels at the rebar depth increase in future decades. Severe corrosion was also absent from locations in two low concrete permeability bridges where preexisting concrete cracks had allowed localized chloride ion penetration. However, in another low permeability concrete bridge in this group (Howard Frankland) significant ECR corrosion was observed at previously cracked concrete locations where the crack intersected the rebar. This observation is an important warning of potentially severe local damage in the future. Frequent monitoring of these and similar locations is advisable. An improved durability projection model was applied to improve ECR corrosion performance predictions in sound concrete. Electrochemical Impedance Spectroscopy (EIS) measurements of EC R in extracted cores showed good potential for non destructive characterization of the extent of coating damage. The technical content of this investigation is closely supplemented by that of the companion FDOT project, 'Corrosion of Steel in Locally Deficient Concrete', BD544-31.
Corrosion Evaluation of Bridges with Epoxy-Coated Rebar
Epoxy coated steel reinforcement (ECR) was used for corrosion control in FDOT marine reinforced concrete bridges from the late 1970's up to the early 1990's. However, severe ECR corrosion developed in some Florida Keys Bridges. Investigations completed in 1993 showed that those structures had concrete with high permeability. Early models projected corrosion development of other FDOT ECR structures with moderate concrete permeability after one more decade or so, and lesser likelihood of observing corrosion at that in other bridges with lower concrete permeability. The investigation examined the present corrosion condition of 13 ECR structures to validate and refine those earlier projections. Damage was found to have progressed steadily in the bridges showing early corrosion. Externally recognizable ECR corrosion damage was found, as expected, in other bridges with intermediate concrete permeability. No severe ECR corrosion developed when the coated bar was protected by a thick cover of sound, very low permeability concrete as encountered in very low concrete permeability bridges. However, there was widespread disbondment of the epoxy coating in all these structures even in sound concrete locations. This disbondment together with observed frequent coating breaks are expected to facilitate corrosion initiation as chloride levels at the rebar depth increase in future decades. Severe corrosion was also absent from locations in two low concrete permeability bridges where preexisting concrete cracks had allowed localized chloride ion penetration. However, in another low permeability concrete bridge in this group (Howard Frankland) significant ECR corrosion was observed at previously cracked concrete locations where the crack intersected the rebar. This observation is an important warning of potentially severe local damage in the future. Frequent monitoring of these and similar locations is advisable. An improved durability projection model was applied to improve ECR corrosion performance predictions in sound concrete. Electrochemical Impedance Spectroscopy (EIS) measurements of EC R in extracted cores showed good potential for non destructive characterization of the extent of coating damage. The technical content of this investigation is closely supplemented by that of the companion FDOT project, 'Corrosion of Steel in Locally Deficient Concrete', BD544-31.
Corrosion Evaluation of Bridges with Epoxy-Coated Rebar
K. Lau (author) / A. A. Sagues (author)
2009
60 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Coatings, Colorants, & Finishes , Corrosion & Corrosion Inhibition , Bridge decks , Epoxy coatings , Reinforcing steels , Corrosion , Bridges , Concrete cracking , Durability forecasting , Cracking , Delamination , Field tests , Highway bridges , Epoxy coated steel reinforcement (ECR) , Epoxy coated rebar , Marine reinforced concrete bridges , Florida Keys bridges
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