Use of epoxy-coated reinforcing bars has become widespread in recent years. A properly applied epoxy coating will provide corrosion protection for rebars in bridge decks, pavements, parking garages and other structures exposed to chlorides. If the rebar coating is damaged, however, protection will be less effective. Epoxy-coated reinforcing bars should be inspected for damaged coating when they are received at the jobsite and they should also be inspected after they are placed in the structure, before concrete is poured. Specifications require that coating damaged during bar handling and fabrication be repaired if damage exceeds certain limits.
INSPECTING FOR DAMAGE
Most project specifications permit individual damaged spots up to a certain area or size without requiring repair. Typically, the limit in project specifications on acceptable spots of damaged coating is in the order of 0.063 square inch ( 1/4 inch by 1/4 inch).