NEW YORK High-strength
steel (HSS) rebar can now be incorporated into bridge designs
thanks to revised regulations, according to specialty concrete
reinforcing steel producer MMFX Steel Corp. of America.
The American Association of
State Highway and Transportation Officials (AASHTO) has updated
its specifications to allow bridges to use HSS. Prior to the
revisions, engineers could only use reinforcing steel with a
yield of up to 75 kilopounds per square inch (ksi), but bridge
builders can now use high-strength specialty rebar of up to 100
ksi, which could potentially cut costs by using less
State transportation departments
use AASHTOs specifications to establish local bridge
The groups approval of HSS
was based on a 2011 National Cooperative Highway Research
Program report, which said HSS could reduce the amount of steel
required to reinforce a structure, "leading to savings in
material, shipping and placement costs."
"The updated specification will
benefit state and federal efforts to rebuild the nations
infrastructure with lower costs while using higher-strength
reinforcing steel," said Tom Russo, chief executive officer of
MMFX Steel parent MMFX Technologies Corp., Irvine, Calif.
MMFX Steelwhich licenses a
100-ksi rebar to McMinnville, Ore.-based Cascade Steel Rolling
Mills Inc.said the updated specifications will result in
increased demand for high-strength rebar. "(Engineers) can
reduce the amount of steel utilized in highway bridge design,"
a spokesman said. "It allows them to be more efficient in their