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Date 24/10/2008

Sustainable Construction Reaches New Heights in Philadelphia with NewCem -- High-Performance, Environmentally-Friendly Slag Cement

Lafarge North America Inc.

Herndon, VA


Nation's tallest green office building relies on Lafarge's innovative slag cement product to achieve high strength, long-term durability, and sustainability goals.


The new Comcast Center in downtown Philadelphia - featuring 1.25 million square feet of office, restaurant and retail space - now has the distinction of being the nation's tallest green office building. A spectacular addition to the city's skyline when it was officially opened this summer, the high-performance skyscraper was constructed with a concrete mix consisting of 40 percent Lafarge NewCem® brand slag cement and 60 percent Type I cement.


Engineered for high strength and long-term durability, NewCem slag cement helps achieve greater strength potential, reduced permeability, and increased resistance to chemical attack in concrete structures. Soaring 58 stories and 975 feet, the Comcast Center tower required 50,000 cubic yards of concrete, of which 36,000 cubic yards had to be 10,000 psi-specified for its inner core.


The mix used in the project reached strengths as great as 14,000 psi, which is one of the key reasons why the NewCem slag cement was selected for this high-performance application. An additional 3,000 tons of the product also was used for the lighter weight concrete on each floor.


NewCem slag cement was also a strong contributor to the tower's sustainable building design, which is expected to earn the Comcast Center a LEED silver certification from the U.S. Green Building Council. The use of slag cement in concrete saves virgin raw materials, consumes less energy, and makes use of a of a recyclable by-product material of the iron-making process that might otherwise be disposed of in landfills. The result is high-performance concrete with less environmental impact.


Contacts: Steve Meima,

Lafarge North America:





Bob Palangio,

Al Paul Lefton Company



Leader mondial des matériaux de construction, Lafarge occupe une position de premier plan dans chacune de ses activités : Ciment, Granulats & Béton et Plâtre. Avec 78 000 collaborateurs dans 78 pays, le Groupe a réalisé en 2009 un chiffre d'affaires de 15,9 milliards d'euros.

En 2010, pour la sixième année consécutive, Lafarge est répertorié dans la liste des 100 multinationales les plus engagées en matière de développement durable. Doté du premier centre de recherche au monde sur les matériaux de construction, Lafarge place l'innovation au cœur de ses préoccupations, au service de la construction durable et de la créativité architecturale.

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