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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: Effect of Silica Fume on Alkali-Silica Expansion in Mortars
Author(s): Mitsunori Kawamura, Kunio Takemoto,
and Shigemasa Hasaba
Publication: Special Publication
Appears on pages(s): 999-1013
Keywords: alkali content; expansion; microhardness; mortars
(material); opal; silica; silica gel; x-ray analysis.
Abstract:The expansion of mortars containing up to at least 10% silica fume by weight of cement were about three times as great as that of the additive-free mortar. Concentrations of calcium and alkalies within opal grains in the silica fume mortars were determined by energy dispersive x-ray analysis(EDXA). The intrusion of smaller amounts of calcium into opal grains in the mortars at early ages seems to show that the conversion of alkali-silica gels into sols was delayed by the presence of silica fume. The delay of this conversion was also confirmed by microhardness measurements.
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