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ACI Spring 2010 Convention
March 21 - 25, 2010
Marriott Rivercenter Hotel & Henry B. Gonzalez Convention Center -- San Antonio, TX

NRMCA Sustainable Conference
April 12 - 15, 2010
Tempe, AZ

International Parking Institute Conference & Expo
May 10 - 12, 2010
Mandolay Bay - Las Vegas, NV

International Bridge
Conference 2010

June 6 - 9, 2010
David L. Lawrence Convention Center - Pittsburgh, PA

ACI Fall 2010 Convention
October 24 - 28, 2010
The Westin Convention Center -- Pittsburgh, PA

 
Chapter 2 - Using Silica Fume in Concrete
Enhancing Mechanical Properties

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Slide
For this 57-story high-rise structure in downtown Cleveland, the engineer specified a concrete with a compressive strength of 12,000 psi and a modulus of elasticity of 6,800,000 psi. This very high modulus was necessary to stiffen the structure against sway caused by wind from nearby Lake Erie. The high modulus was achieved using local aggregates in a concrete with an average compressive strength at 56 days over 15,000 psi.

The concrete for this structure contained a combination of portland cement, blast furnace slag, and silica fume. The water-cementitious materials ratio was 0.24. A combination of chemical admixtures was used to produce a minimum slump of 10 in.