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07286 CORROSION PERFORMANCE OF EPOXY-COATED REINFORCING BARS IN A BRIDGE SUBSTRUCTURE IN MARINE ENVI

Picture for 07286 CORROSION PERFORMANCE OF EPOXY-COATED REINFORCING BARS IN A BRIDGE SUBSTRUCTURE IN MARINE ENVI
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Product Number: 51300-07286-SG
ISBN: 07286 2007 CP
Author: Fushuang Cui, John Lawler and Paul Krauss
Publication Date: 2007
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To evaluate the corrosion performance of epoxy-coated reinforcing bars in concrete in marine environments, a condition survey of a Georgia concrete bridge substructure constructed in 1984 and reinforced with epoxy-coated steel bars was conducted. The field survey of this structure included visual physical condition inspection, concrete cover measurement, half-cell potential measurement, concrete coring, and epoxy-coated bar sampling. Concrete cores taken from the structure were sectioned for chloride analysis, and sampled bar segments were inspected for coating adhesion, coating thickness, extent of damage and corrosion. No concrete distress induced by corrosion of epoxy-coated bars was observed. Low coating adhesion was observed on all sampled bars as well as various levels of coating damage. The average coating thickness was 155 µm (6.1 mils), and 18% of the measurements were smaller than 125 µm (5 mils). The coating apparently did not meet the thickness requirements of either ASTM A775-81 Standard Specification for Epoxy-Coated Steel Reinforcing Bars (valid at the time of the bridge construction) or the current version of this specification, ASTM A775-06.
To evaluate the corrosion performance of epoxy-coated reinforcing bars in concrete in marine environments, a condition survey of a Georgia concrete bridge substructure constructed in 1984 and reinforced with epoxy-coated steel bars was conducted. The field survey of this structure included visual physical condition inspection, concrete cover measurement, half-cell potential measurement, concrete coring, and epoxy-coated bar sampling. Concrete cores taken from the structure were sectioned for chloride analysis, and sampled bar segments were inspected for coating adhesion, coating thickness, extent of damage and corrosion. No concrete distress induced by corrosion of epoxy-coated bars was observed. Low coating adhesion was observed on all sampled bars as well as various levels of coating damage. The average coating thickness was 155 µm (6.1 mils), and 18% of the measurements were smaller than 125 µm (5 mils). The coating apparently did not meet the thickness requirements of either ASTM A775-81 Standard Specification for Epoxy-Coated Steel Reinforcing Bars (valid at the time of the bridge construction) or the current version of this specification, ASTM A775-06.
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Product Number: 21018-SG
Publication Date: 2007
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