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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: Pozzolanic behavior of thermally activated kaolin
Author(s): J. Ambroise, S. Martin-Calle, and J. Pera
Publication: Special Publication
Appears on pages(s): 731-748
Keywords: amorphous phase; calcination; chemical analysis; clays; kaolin; dehydration; metakaolin; mineralogical analysis; particle size distribution; lime; pozzolanic reactions; temperature; Materials Research
Abstract:After calcination at 650 to 850 C, kaolinitic clays show an interesting pozzolanic property. Thermal activation leads to metakaolin, an amorphous phase which is very reactive. In this study, different clays were tested with various granular sizes and calcination parameters. The pozzolanic properties were investigated using metakaolin-lime mixtures by the evaluation of both the mechanical strength and combined lime. The mineralogical composition, particle size distribution, and degree of amorphousness were the main factors affecting the pozzolanic activity of calcined clays. Influence of the pozzolanic activity on the mechanical and durability properties of concrete was established from test results on blended portland-metakaolin cements.
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