Performance evaluation of Iowa bridge decks constructed with epoxy-coated reinforcing bars.
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2011-08-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
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Abstract:Epoxy coatings have been used on the embedded reinforcing bars of bridge decks since the mid-1970s to
mitigate deterioration caused by chloride-induced corrosion. The use of chloride-based deicers became
common in the early 1960s and caused corrosion of conventional uncoated bars in bridge decks within 5
to 10 years of commencement of deicer applications. In response to this rapid deterioration, the National
Bureau of Standards researched coatings to protect the reinforcement (National Bureau of Standards,
1975), resulting in the development of epoxy-coated reinforcing bars, which were used in bridge decks
beginning in 1973. While corrosion-related deterioration has been prevalent on bridge decks with
uncoated reinforcing bars in northern climates where the use of deicing salts is common, bridge decks
constructed after 1973 with epoxy-coated reinforcing have shown good corrosion resistance with only
limited exceptions. On the whole, previous laboratory and field studies regarding the performance of
epoxy-coated reinforcing bars are very promising; however, some laboratory and field studies have
yielded differing results.
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