New York, NY
Award: Innovative Applications
Owner: Extrell Development Company
Contractor: GC-Lendlease/ Concrete - Pinnacle Industries
Architect: Adrian Smith + Gordon Gill Architecture
Engineer: WSP Global
Concrete: Empire Transit Mix
Slag Cement: Lehigh Hanson
In this project a total of 100,000 cubic yards of concrete was used. Slag cement enhanced the project by:
High PSI (16k psi)
Sustainability (40% slag cement mix offered a significant co2 reduction)
Low heat of hydration for mass pours (70% slag) which were 12 feet thick.
The use of slag cement resulted in structural, sustainable and mass concrete attributes.
This tower is a super- tall skyscraper known as one of a handful of “Pencil-Towers” in the world. It is the tallest primarily residential building in the world, tallest building in the western hemisphere, and the tallest roof in the western hemisphere. This project has a 28 foot cantilevered section that starts at 300 feet above ground, over an adjacent building, and reaches up 1,200 feet above.
% Slag Cement Replacement
30 to 70% depending on application
70 to 30% depending on application
% Portland Limestone Cement
% Other SCM (if applicable)
2 to 4% silica fume depending on application
#67 and fine agg
.28 to .38
9,000 to 14,000 psi depending on mix
12,000 to 18,000 psi depending on mix