History of Reinforcing Steel - CRSI

Year Event First reinforcing bar specifications issued. ASTM A15 published with grades 33 and 50. ASTM A15 revised by adding grade 40. The American Association of State Highway Officials (AASHO) issued its first standard for concrete reinforcement, AASHO M 31. First hot-dip galvanized reinforcing bar specifications published, ASTM A123. ASTM A305 published; it included rebar deformation patterns. U.S. Navy uses galvanized rebar in a bridge in Bermuda. ASTM A408 published; it covered large diameter bars (no.14 and no.18 bars) in three different grades. ASTM A431 published; it included grade 75 rebar. ASTM A432 published; it included grade 60 rebar. ASTM A305, ASTM A408, ASTM A431, and ASTM A432 withdrawn. ASTM A615 published (replaced ASTM A15, ASTM A408, ASTM A431, ASTM A432, and portions of ASTM A305) with grades 40, 60, and 75. ASTM A15 withdrawn. ASTM A615 revised, removing grade 75 rebar. Epoxy-coated rebar first used in a U.S. bridge. ASTM A706 published for rebars with improved weldability. ASTM A767 published for zinc-coated (galvanized) rebars. ASTM A775 for epoxy-coated rebars and ASTM D for handling of epoxycoated bars published. The American Association of State Highway and Transportation Officials (AASHTO) published the metric version of standard M31, known as AASHTO M 31M. Stainless steel rebar first used in U.S. bridges. ASTM A615 revised, reinstating grade 75. AASHTO published M 284 for epoxy-coated rebars. ASTM A775/A775M revised to change damage threshold and add anchor profile. ASTM A775/A775M revised with provisions for repairing damaged coating. FHWA memorandum issued on certification programs. The Concrete Reinforcing Steel Institute (CRSI) began a certification program for epoxy-coating applicator plants. ASTM A775/A775M revised to change the coating thickness. ASTM A775/A775M revised to change the bend tests. ASTM A934/A934M published for prefabricated epoxy-coated rebar. ASTM A775/A75M revised to allow a chemical wash for surface preparation. ASTM A955/A955M published for stainless steel rebars. Cathodic debonding introduced in ASTM A775/A775M and A934/A934M. AASHTO issued AASHTO M 317M/M 317. ASTM A995 revised. ASTM A/AM published. ASTM A615/A615M renamed. ASTM A775/775M revised. AASHTO MP 13M/MP 13 published. ASTM A955 revised. ASTM A published for zinc and epoxy dual coated rebars. STM A615/A615M revised, adding grade 80. ASTM A706/A706M revised, adding grade 80. AASHTO MP 18M/MP 18 published. AASHTO discontinued AASHTO M 284M/M 284. It was replaced by ASTM A775/A775M. AASHTO discontinued AASHTO M 317M/M 317. It was replaced by ASTM D/DM. ASTM A615/A615M revised, adding grade 100. ASTM A/AM revised. ASTM A/AM published for continuous hot-dip galvanized steel rebars. AASHTO updated AASHTO MP 18M/MP 18.

This year, the epoxy-coated reinforcing industry celebrates 40 years of corrosion protection for steel in concrete. Since , epoxy-coated reinforcing steel has been used in construction projects worldwide, especially in the United States, Canada, Japan, China, India and the Middle East. In the U.S. alone, more than 74,000 bridge decks covering 850 million square feet utilize epoxy-coated reinforcing steel.

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The coating and application processes of epoxy-coated reinforcing steel have evolved over the past 40 years. These changes have resulted in epoxy-coated reinforcing steel products that are more flexible, robust and durable, and are reflected in the product specifications ASTM A775 and ASTM A934 for reinforcing bar and ASTM A884 for welded wire fabric. For more information, please visit the Concrete Reinforcing Steel Institute's Epoxy Interest Group website.

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