ELABORATION OF OPTIMAL MODE FOR HEAT TREATMENT OF SHALES FOR OBTAINING METAKAOLIN

E. Shapakidze, M. Nadirashvili, V. Maisuradze, I. Gejadze, M. Avaliani, G. Todradze

Abstract


Concrete is highly energy- and material intensive building material. At the same time, the most expensive component of concrete is cement. The use of pozzolanic admixtures in cement and concrete is an effective method to reduce the consumption of clinker part of cement. In recent years, metakaolin has been very popular in the world as an effective pozzolanic admixture to cement. Addition of metakaolin makes it possible to increase density, water proofness and strength of cement. Metakaolin is received by heat treatment of kaolin clays, the deposits of which are highly limited. Therefore, studies are under way to investigate the possibility of obtaining metakaolin from ordinary polymineral clays and shales, which would be much cheaper and would make the production of this material affordable. In our experiments, to receive metakaolin were used alluvium clay shales formed as a result of mud flows. The optimal mode of heat treatment of clay shales has been elaborated, which ensures maximal presence of metakaolin. To determine the pozzolanic properties of heat-treated clay shales, cements were made in accordance of ASTM C 311–05 standard test methods for sampling and testing fly ash or natural pozzolans for use in portland cement concrete.


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DOI: http://dx.doi.org/10.17628/ecb.2019.8.31-33

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