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Bagley Avenue Pedestrian Bridge, Detroit, MI

Urban growth requires sustainable development of highways, bridges and other transportation systems to improve mobility, quality of life and economic vitality. Lafarge is making a strong contribution to building better-connected cities with high-performance solutions for constructing all types of infrastructure, such as the Bagley Avenue Pedestrian Bridge that arcs across two freeways to unite a Detroit neighborhood community.

 

The elegant cable-stayed bridge is considered one of the most exciting elements of the $230 million Gateway Project-the largest project ever undertaken by the Michigan Department of Transportation (MDOT). The objective of this massive economic development initiative is to ease traffic congestion by providing a direct connection to freeways from the Ambassador Bridge, which handles about 25% of all surface trade between the U.S. and Canada. This international border crossing, the busiest in North America, is vital to the success of thousands of businesses.  

 

Easily visible from the Ambassador Bridge, the $7 million Bagley Avenue Pedestrian Bridge-winner of a design award from the American Institute of Architects-gracefully spans 407 feet across I-96 and I-75. Marked by a concrete pylon that soars 150 feet above the freeway floor, the bridge is supported by 15 tension cables radiating from the pylon and varies in width from 10 to 31 feet. To achieve the specified 6,000-psi high-performance concrete for the cast-in-place pylon, MDOT engineers relied on Lafarge's Tercem 3000® cement. This precisely formulated blend of portland cement, granulated blast furnace slag and silica fume works synergistically to meet the requirements for high strength, long-term durability and reduced permeability. It also offers excellent finishing qualities and improved resistance to alkali-silica reactions, as well as exceptional freeze-thaw resistance.  

 

MDOT engineers also appreciated the substantial environmental benefits. The production of Tercem saves virgin raw materials and makes use of silica fume and slag, which are by-products of silicon metal operations and steelmaking that might otherwise be disposed of in landfills. A local supply of high-quality, pre-blended cement from Lafarge's Detroit Terminal and Blending Station was also a key benefit according to MDOT. This automated facility creates precisely proportioned and fully blended products that provide a high degree of consistency, reliability and quality control to any project.

 

Courtesy: MDOT Photograpy Unit

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LafargeHolcim. Cement, aggregates, Concrete.