Resumen

TORRES AGREDO, JANNETH  y  MEJIA DE GUTIERREZ, RUBY. INFLUENCE OF THE MINERALOGICAL COMPOSITION OF KAOLINS ON THE PERFORMANCE OF ADDED MORTARS WITH MK. Dyna rev.fac.nac.minas [online]. 2007, vol.74, n.153, pp.61-67. ISSN 0012-7353.

This work forms part of a research project, aiming at using metakaolin (MK) in concrete manufacture. This paper is focused on the performance of two types of metakaolin. Origin kaolin and high purity commercial kaolin were used as raw materials which show a different mineralogical composition (48 and 97% of kaolinite). The pozzolanic activity of the metakaolin was evaluated according to ASTM C311 test and determining the amount of calcium hydroxide consumed during the pozzolanic reaction by termogravimetric analysis (TGA). The properties of capillarity absorption and chloride permeability of cement mortars were determined. Each MK was incorporated into the mortar in proportions of 10 and 20% by mass of cement. A better behaviour was verified for the mortars added by MK obtained from high purity Kaolin; nevertheless with 20% of addition the difference between the properties of the mixtures with both different MK is minimal, which indicates a possibility of utilization of poor kaolin to produce this type of pozzolan.

Palabras clave : Kaolin; mineralogical composition; Metakaolin; pozzolanic activity; durability properties.

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