Reinforcing Steel Timeline

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ASTM A305, ASTM A408, ASTM A431, and ASTM A432 withdrawn.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ASTM A15 withdrawn.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.

NOTE: Information based on FHWA Publication No.: FHWA-HRT-16-012