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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 Metakaolin on External Sulfate Attack
Author(s): T. Ramlochan and M. Thomas
Publication: Special Publication
Appears on pages(s): 239-252
Keywords: blended cements; ettringite; gypsum; pozzolans; sulfate attack
Abstract:This paper reports a study on the effect of a high-reactivity meakaolin (HRM) on the sulphate resistance of mortars. Mortar bars containing 0-25% HRM were prepared in accordance with ASTM C 1012-89 with three cements of varying C3A content. After 6 months of exposure to a 5% Na2SO4 Solution, mortar bars incorporating any level of HRM (5-25%) as a partial replacement for a high-C3A cement (~10%C3A) may be considered "moderate sulphate resistant"; mortar bars made with HRM and a moderate or low-C3A cement (<6% C3A) may be considered "high-sulphate resistant". Beyond 6 months, however, it was found that insufficient levels of HRM may, in fact, reduce the sulphate resistance of some cements, and that 15% HRM, or more, may be required for long term sulphate resistance, depending on the C3A content of the cement.
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