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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
Improving Durability

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This graph shows the results of abrasion-erosion testing done by the Corps of Engineers according to their own underwater test method*. The upper line labeled "Kinzua cores" shows the results of testing large-diameter cores taken from the stilling basin concrete shown in the previous slide. The G1 aggregate is the locally available aggregate in a concrete with conventional compressive strength. The Chert aggregate line is a reference concrete made with a very hard aggregate. The silica fume line represents the G1 aggregate in concrete containing silica fume with a compressive strength of about 12,000 psi (83 MPa). Based upon the results of such testing, the Corps of Engineers specified silica- fume concrete with a minimum 28-day compressive strength of 12,500 psi (86 MPa) for the second repair.

*CRD-C 63-80, Test Method for Abrasion-Erosion Resistance of Concrete (Underwater Method).