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Date 08/08/2010

New Liberty Memorial Bridge Built For Long-Term Durability With Lafarge's Environmentally-Friendly, High-Performance Fly Ash Concrete

Herndon, VA

Lafarge North America Inc.


Spanning 2370 feet over the Missouri River, signature bridge for Bismarck, ND, relies on supplementary cementitious material to achieve high strength, long-lasting structural concrete.


High-performance fly ash concrete from Lafarge is playing a key role in achieving the high strength, long-term durability, and extended service life goals for the new Liberty Memorial Bridge in Bismarck, ND. This signature high-profile, long-span bridge, dedicated to honoring North Dakotan veterans, provides more vertical clearance for tall boats and has a longer than average space between the sup-ports that hold the bridge above the water, allowing more of the river and scenery to show. The massive center section of the bridge is over 285 feet in length, with a total of 14 spans on 13 piers, with 6 piers located in the Missouri River.


The $62-million 2370-foot-long structure used almost 20,000 cubic yards of high-performance 35 MPa (5,000 psi) concrete containing Class F fly ash and Type I/II portland cement. As our transportation infrastructure continues to age and deteriorate, greater attention is being given to life-cycle costs and the use of innovative concrete mix designs to build longer-lasting, low-maintenance bridges. Derived from burning coal in electric utility plants, fly ash can be used as a supplementary cementitious material for improving the strength, durability, and other properties of concrete. In addition to its economic and performance advantages, fly ash use in concrete is also good for the environment as it saves virgin raw materials and makes use of an industrial by-product that might otherwise be disposed of in landfills. It also allows concrete producers to optimize their use of portland cement, thereby reducing the carbon footprint and lowering the embodied energy of concrete.


The Liberty Memorial Bridge project began in mid-2006 and the first phase of construction-one lane open in each direction-was completed in November 2008. The environmentally-friendly, high-performance fly ash concrete mix design met quality construction needs during both hot weather and freezing winter conditions, as well as for the mass concrete pours requirements in the piers and abutments. The project's final construction phase-removal of the old bridge and completion of the new four-lane bridge with plazas and riverside parks-is expected to be finished in July 2010. The bridge design incorporates a 10-foot wide pedestrian walkway and five overlooks or concrete walkouts as a tribute to each branch of the military: Army, Navy, Air Force, Marines, and Coast Guard.



Steve Meima

Lafarge North America Inc.


Fly ash concrete Liberty Memorial Bridge

Liberty Memorial Bridge


The Lafarge Group is the world leader in building materials, with top-ranking positions in all of its businesses: Cement, Aggregates & Concrete and Gypsum. With 78,000 employees in 78 countries, the Group posted sales of 15.9 billion Euros in 2009. Lafarge North America Inc. ("Lafarge North America" or "Lafarge"), a Lafarge Group company, is the largest diversified supplier of construction materials in the United States and Canada.

In 2010 and for the sixth year in a row, the Lafarge Group was listed in the "Global 100 Most Sustainable Corporations in the World". With the world's leading building materials research facility, the Lafarge Group places innovation at the heart of its priorities, working for sustainable construction and architectural creativity.

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