What's New / Hot

News and Events

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 3 - Obtaining Silica-Fume Concrete
Proportioning SFC

Previous Next
Mixing in a laboratory mixer may not be vigorous enough to break up all of the silica-fume agglomerations in the densified form of the product. Either use undensified silica fume or batch densified silica fume with the coarse aggregate and mix for several minutes before adding the remainder of the ingredients.

Depending upon silica-fume content and water-cementitious materials ratio, there may be no measurable slump before the chemical admixtures are added. It may be appropriate to add a WRA early in the mixing process and a HRWRA after the cementitious materials are wetted.