Reinforced concrete: Difference between revisions

In wet and cold climates, reinforced concrete for roads, bridges, parking structures and other structures that may be exposed to [[deicing]] salt may benefit from use of corrosion-resistant reinforcement such as uncoated, low carbon/chromium (micro composite), epoxy-coated, hot dip galvanized or [[stainless steel]] rebar. Good design and a well-chosen concrete mix will provide additional protection for many applications.

Uncoated, low carbon/chromium rebar looks similar to standard carbon steel rebar due to its lack of a coating; its highly corrosion-resistant features are inherent in the steel microstructure. It can be identified by the unique ASTM specified mill marking on its smooth, dark charcoal finish. Epoxy -coated rebar can easily be identified by the light green color of its epoxy coating. Hot dip galvanized rebar may be bright or dull gray depending on length of exposure, and stainless rebar exhibits a typical white metallic sheen that is readily distinguishable from carbon steel reinforcing bar. Reference ASTM standard specifications '''A1035/A1035M''' Standard Specification for Deformed and Plain Low-carbon, Chromium, Steel Bars for Concrete Reinforcement, '''A767''' Standard Specification for Hot Dip Galvanized Reinforcing Bars, '''A775''' Standard Specification for Epoxy Coated Steel Reinforcing Bars and '''A955''' Standard Specification for Deformed and Plain Stainless Bars for Concrete Reinforcement.<!-- [[American Concrete Institute|ACI]] 440 provides information about properties and design of FRP reinforced concrete structures. The Canadian [[Canadian Standards Association|CSA]] 806 and 807 providing the same information in form of a real standard. In addition the Canadian Highway Design Code is the first standard allowing for composites in bridge construction. -->