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Date 07/24/2014

Durable and Sustainable Construction Reaches New Heights at One World Trade Center With Lafarge NewCem® Slag Cement

Lafarge is contributing to building better cities with high-performance, environmentally friendly slag cement in Western Hemisphere's tallest, safest and resilient skyscraper.

Chicago, IL

Lafarge North America Inc.

 

Rising a symbolic 1,776 feet above the skyline of Manhattan and standing as the tallest skyscraper in the Western Hemisphere, One World Trade Center is setting new standards in building a more resilient, safe and sustainable urban landscape. Monumental in scale, this landmark 104-story tower features 3,500,000 square feet of space that will accommodate activities vital to the nation's economy.

 

Taking advantage of innovative construction materials, One World Trade Center is designed to be the safest and most environmentally friendly commercial building in the world. The structure includes a massive cast-in-place, reinforced concrete inner core that runs the full height of the tower-an extra-strong backbone that provides support for gravitational loads as well as resistance to wind and seismic forces. The concrete core walls measure three feet thick or more above ground and up to twice that below grade. Higher up, the concrete core walls slim down to two feet thick.

 

The 200,000 cubic yards of concrete used in the tower's superstructure-with a strength that has never been used on such a scale in building construction-was custom-designed to ensure high levels of durability, constructability and sustainability. Supporting columns on the first 40 floors were made from 12,000- to 14,000-psi self-consolidating concrete and the upper floors with 8,600- to 10,000-psi mix designs. To meet the compressive strength requirements, the design and engineering team relied on a highly specialized concrete mix that included Lafarge Portland Type I/II and NewCem® slag cements, as well as other supplementary cementitious materials. Engineered for high strength and long-term durability, NewCem slag cement helps achieve greater strength potential and helps control shrinkage, creep and cracking in mass concrete structures.

 

High-strength concrete was the ideal material for meeting the high-priority safety requirements for One World Trade Center because key supporting members-such as elevator and stair enclosures-often relied upon to resist wind, seismic and other impact forces, are designed with an extra measure of durability and resilience. The concrete also made a strong contribution to the sustainable design of the building, which is expected to receive LEED® Gold certification when it opens later this year. In addition, the tower was constructed with mostly post-industrial recycled materials, including the NewCem slag cement, which is a by-product of the steel-making process.

 

Image courtesy of The Durst Organization.

Contact:

Dawn Stefano

Marketing Communications & Branding Manager, U.S.

Ph: 703-480-3667    

E-mail: dawn.stefano@lafarge.com 

ADDITIONAL INFORMATION

Lafarge North America Inc. ("Lafarge") has close to 200 industrial and distribution sites and approximately 2,700 employees in 40 states in its U.S. cement, aggregate and concrete businesses. Lafarge U.S. is an operating unit of Lafarge North America Inc. Lafarge is committed to contributing to Building Better Cities and being active in local environment, education and sustainable construction partnerships including the Wildlife Habitat Council, Habitat for Humanity and the National Building Museum. More information is available on the Lafarge North America website: www.lafarge-na.com



Lafarge S.A., together with its subsidiaries (the "Lafarge Group" or the "Group"), is the world leader in building materials and employs 64,000 people in 62 countries, and posted sales of €15.2 billion in 2013. As a top-ranking player in its Cement, Aggregates and Concrete businesses, the Group contributes to the construction of cities around the world, through its innovative solutions providing them with more housing and making them more compact, more durable, more beautiful and better connected. Lafarge North America Inc. and its subsidiaries, including Lafarge Canada Inc., are Lafarge Group companies, and together constitute the largest diversified supplier of construction materials in the United States and Canada.

 

With the world's leading building materials research facility, the Lafarge Group places innovation at the heart of its priorities in order to contribute to more sustainable construction and to better serve architectural creativity. More information is available on the Lafarge Group's website: www.lafarge.com

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