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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Use of Condensed Silica Fume in Grouts
Author(s): Pierre-Claude Aitcin, G. Ballivy,
and R. Parizeau
Publication: Special Publication
Appears on pages(s): 1-18
Keywords: bleeding (concrete); compressive strength; grout;
plasticizers; porosity; pozzolans; shrinkage; silica; thixotropy
viscosity; water-cement ratio.
Abstract:Condensed silica fume is a by-product of the fabrication of silicon or ferrosilicon alloys. It is composed of very fine glassy spheres of quite pure silica having an average diameter of 0.1 pm. It is a very reactive pozzolan that has been found to increase drastically the compressive strength of concrete and to reduce significantly its permeability. The unique properties of condensed silica fume can also be used advantageously in grouts if condensed silica fume is used in combina-tion with a superplasticizer. The very fine silica particles give stability to the grout, there is no sedimentation of the cement particles and no bleeding. By adjusting the respective proportions of portland cement, of condensed silica fume,and of the superplasticizer a thixotropic grout can be made. The hardened grout is stronger and less porous when it contains condensed silica fume because the lime liberated during the hydration of portland cement reacts with the very fine silica particles to form a compact secondary CSH. By this way the possibility of leaching out of the lime is practically suppressed and the resistance of the grout to chemical attack should be improved.
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