Performance of Concretes Incorporating Various Forms of Silica Fume


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Title: Performance of Concretes Incorporating Various Forms of Silica Fume

Author(s): J. Wolsiefer, Sr., V. Sivasundaram, V. M. Malhotra, and G. G. Carette

Publication: Special Publication

Volume: 153


Appears on pages(s): 591-656

Keywords: blended cements; chlorides; compacting; compressive strength; drying shrinkage; flexural strength; mix proportioning; permeability; silica fume; slurries; Materials Research

Date: 6/1/1995

Presents the results of a joint project between CANMET, Ottawa, Canada, and NORCHEM Concrete Products, Inc., Hauppauge, New York, on the performance of concretes incorporating various forms of silica fume. Eleven different product forms of silica fume were used in four series of concrete with water-cementitious materials ratio of 0.40, 0.35, 0.30, and 0.22. Test specimens from the above concretes were subjected to varying curing conditions and were tested for compressive and flexural strengths, drying shrinkage, and rapid chloride permeability. It was found that, in general, the performance of the silica fume concretes in terms of mechanical properties was comparable, regardless of the silica fume product form used and the SiO 2 content of the fumes. The Rapid Chloride Permeability values, in coulombs at 41 days, a measure of the resistance of concrete to the penetration of chloride ions (AASHTO T277) for all the silica fume concretes tested except those made with silica fume blended cements, ranged from 94 to 346 coulombs, indicating very low permeability of the concretes. The values for concretes made with the blended silica fume cements were slightly higher.