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One World Trade Center - Freedom Tower

Award Description

One World Trade Center is the main building of the new World Trade Center in lower Manhattan, New York City, NY. Construction on the building began in April 2006 and when it is completed in 2013, it will be the tallest building in the United States. The structural columns are comprised of steel and concrete. The concrete performance for these columns is divided into four phases consisting of 14,000psi, 12,000psi, 10,000psi and 8,600psi from the lower portion of the building to the top respectively.

The 14,000 and 12,000psi phases of the project were extremely challenging and the subject of the GreenSite award submittal. Approximately 38,000 cubic yards of these concrete mixes were used in the columns through the first 40 floors.

To achieve the desired concrete properties, Eastern concrete partnered with their Admixture Supplier BASF Construction Chemicals to develop the two high-strength column mixes. Not only did these innovative mix designs meet and exceed the project requirements, the significantly lowered the environmental footprint of the concrete using state-of-the-art concrete technologies.

Project Savings
Fresh Water Savings
30,492 gallons
Equivalent to:
Amount of water needed to wash out 136 ready mix trucks
230,826, 1/2 L bottles of drinking water
761 loads of laundry
2,436 showers

Environmental Savings
Energy - 8,259,654 kWh (equivalent to powering 714 homes for 1 year)
Air Emissions - 12,193,323 lb CO2 equiv. (equivalent to 6,928 acres of forest uptake)
Air Emissions - 77,949 lb SO2 equiv. (equivalent to taking 5,196 air conditioners out of service)
Solid Emissions - 424,977 lb (equivalent to the annual solid waste generated by 84,995 people)
Fossil Fuel - 749,075 lb (equivalent to saving 9,626 barrels of oil)

Project Participants

• Concrete Producer - Eastern Concrete Materials, Elmwood Park, NJ
• BASF Construction Chemicals, Beachwood, OH

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