| Year |
Event |
| 1910 |
First reinforcing bar specifications issued. |
| 1911 |
ASTM A15 published with grades 33 and 50. |
| 1914 |
ASTM A15 revised by adding grade 40. |
| 1924 |
The American Association of State Highway Officials (AASHO) issued its first standard for concrete reinforcement, AASHO M 31. |
| 1928 |
First hot-dip galvanized reinforcing bar specifications published, ASTM A123. |
| 1947 |
ASTM A305 published; it included rebar deformation patterns. |
| 1953 |
U.S. Navy uses galvanized rebar in a bridge in Bermuda. |
| 1957 |
ASTM A408 published; it covered large diameter bars (no.14 and no.18 bars) in three different grades. |
| 1958 |
ASTM A431 published; it included grade 75 rebar. |
| 1959 |
ASTM A432 published; it included grade 60 rebar. |
| 1968 |
ASTM A305, ASTM A408, ASTM A431, and ASTM A432 withdrawn.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. |
| 1969 |
ASTM A15 withdrawn. |
| 1972 |
ASTM A615 revised, removing grade 75 rebar. |
| 1973 |
Epoxy-coated rebar first used in a U.S. bridge. |
| 1974 |
ASTM A706 published for rebars with improved weldability. |
| 1979 |
ASTM A767 published for zinc-coated (galvanized) rebars. |
| 1981 |
ASTM A775 for epoxy-coated rebars and ASTM D3963 for handling of epoxycoated bars published. |
| 1982 |
The American Association of State Highway and Transportation Officials (AASHTO) published the metric version of standard M31, known as AASHTO M 31M. |
| 1983 |
Stainless steel rebar first used in U.S. bridges. |
| 1987 |
ASTM A615 revised, reinstating grade 75. AASHTO published M 284 for epoxy-coated rebars. |
| 1989 |
ASTM A775/A775M revised to change damage threshold and add anchor profile. |
| 1990 |
ASTM A775/A775M revised with provisions for repairing damaged coating.
FHWA memorandum issued on certification programs. |
| 1991 |
The Concrete Reinforcing Steel Institute (CRSI) began a certification program for epoxy-coating applicator plants. |
| 1992 |
ASTM A775/A775M revised to change the coating thickness. |
| 1994 |
ASTM A775/A775M revised to change the bend tests. |
| 1995 |
ASTM A934/A934M published for prefabricated epoxy-coated rebar. ASTM A775/A75M revised to allow a chemical wash for surface preparation. |
| 1996 |
ASTM A955/A955M published for stainless steel rebars. |
| 1997 |
Cathodic debonding introduced in ASTM A775/A775M and A934/A934M. |
| 2001 |
AASHTO issued AASHTO M 317M/M 317. |
| 2003 |
ASTM A995 revised. |
| 2004 |
ASTM A1035/A1035M published.
ASTM A615/A615M renamed.
ASTM A775/775M revised.
AASHTO MP 13M/MP 13 published. |
| 2007 |
ASTM A955 revised. |
| 2008 |
ASTM A1055 published for zinc and epoxy dual coated rebars. |
| 2009 |
STM A615/A615M revised, adding grade 80.
ASTM A706/A706M revised, adding grade 80.
AASHTO MP 18M/MP 18 published. |
| 2012 |
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 D3963/D3963M. |
| 2015 |
ASTM A615/A615M revised, adding grade 100.
ASTM A1035/A1035M revised.
ASTM A1094/A1094M published for continuous hot-dip galvanized steel rebars.
AASHTO updated AASHTO MP 18M/MP 18. |
