Bridge steels the show

The

(IDOT) has announced the completion of a new bridge in

,

, constructed with a type of high-performance steel developed by engineering researchers at

.

About 500 tons of the copper alloy steel, known as ASTM A710 Grade B high-performance structural steel, was used in constructing the 430-foot span that carries Illinois Route 83 over Canadian National Railroad tracks. While some landscaping work remains, the bridge opened in its normal traffic pattern yesterday.

‘IDOT is excited about the possibilities presented by this new type of cost-efficient, high-performance steel developed right here in Illinois,’ said IDOT Secretary Timothy W. Martin. ‘Not only is this steel strong, tough and easy to fabricate, but it withstands the elements better than typical steel, meaning it doesn't have to be painted. This makes construction easier and will significantly reduce long-term maintenance costs.’

IDOT is in the process of applying to the American Society for Testing and Materials (ASTM) and the American Association of State Highway and Transportation Officials (AASHTO) to have this steel designated as standard for bridge construction.

The only previous use was in the rehabilitation of the Poplar St. Bridge over the Mississippi River in the Metro East area.

The steel has a strength of 70,000 pounds per square inch (psi) compared with 50,000psi in commonly used structural steel. It is also said to be easy to weld, and tests have shown it has high-impact toughness at low temperatures. In addition, the high copper content gives the alloy much better resistance to atmospheric corrosion than other high-performance steels.

‘We developed this steel nine years ago and application has been a long time in coming,’ said Morris E. Fine, professor emeritus of materials science and engineering at Northwestern University, who developed the new alloy with his colleague Research Professor Semyon Vaynman and with key support from Northwestern's Infrastructure Technology Institute. ‘This steel is cost-effective because its processing is cheaper than competing structural steels of the same strength, its weathering resistance is best, and it's easier to weld.’

‘We are delighted to see our steel used in this new bridge and hope that the steel will be used in other bridges in Illinois as well as in other states,’ said Vaynman, research professor of materials science and engineering at Northwestern.

The Lake Villa bridge was constructed by Dunnet Bay Company with a contract value of $5.75m. The bridge designer was Graef Schloemer and Associates of Chicago. The steel was produced by Mittal Steel USA in Coatesville, Pennsylvania, and fabricated at Industrial Steel Construction in Gary.

The new bridge replaced a structure dating from 1929. Construction was carried out in stages in order to keep traffic flowing.