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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: Use of Condensed Silica Fume in Portland Cement Grouts
Author(s): P. L. Domone and S, B. Tank
Publication: Special Publication
Appears on pages(s): 1231-1260
Keywords: cement content; compressive strength; dynamic modulus of
elasticity; grouts; heat of hydration; mixing; plasticizers;
rheological properties; silica; viscosity; water-cementitious
Abstract:The effects of the partial replacement of portland cement in grouts with condensed silica fume were studied. Initial experiments examinedthe fluid properties of fresh grouts, using concentric cylinder viscometry. An effective mixing procedure using a high-shear mixer was developed Replacements of up to 20% of the cement by silica fume and with water- solids ratios of 0.3 to 0.6 were examined. Two commercially available superplasticers were used - a sulphonated melamine and a sulphonated naphthalene formaldehyde. To maintain fluidity the admixture dosage needs to be increased approximately proportionally to the silica fume content. The grouts are thixotropic and more stable than plain OPC grouts. The silica fume leads to an enhanced alite peak in the rate off heat output during hydration, but the use of the superplasticiser leads to a masking of changes of the time to the peak. Compressive strength at one day and from three days onwards is increased by incorporating condensed silica fume, with greater proportional effects being obtained at higher water-solids ratios . Dynamic elastic modulus values do not show the same increase, and for equal strengths, grouts containing condensed silica fume are less tiff
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