Pozzolanic behavior of thermally activated kaolin


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Title: Pozzolanic behavior of thermally activated kaolin

Author(s): J. Ambroise, S. Martin-Calle, and J. Pera

Publication: Special Publication

Volume: 132


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

Date: 5/1/1992

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.