Metakaolin pozzolanic properties

The commonly used term metakaolin is not correct this pozzolana should be determined as bumed kaolin . The term metakaolinite is brief and relates to the component controlling the pozzolanic properties of material. 

Pera, J., and Ambroise, J., Pozzolanic Properties of Metakaolin Obtained from Paper Sludge, 6th CANMET/ACI Int. Conf. on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Conor., (V. M. Malhotra, ed.), SP-178 1007-1020 (1998)... 

Gutierrez et al. [50] investigated the effect of replacing part of Portland cement by pozzolans as silica fume, fly ash and metakaolin on the mechanical properties of cement mortar reinforced with synthetic and natural fibers. The mechanical behavior and durability of composite materials was improved by replacing 15 wt% of cement with metakaolin or silica fume however, because of its low pozzolanic power, fly ash had no effect on the durability of these materials. Khorami and Ganjian [62] increased flexural strength in 20% of cementitious materials reinforced with straw fibers and eucalyptus, by replacing 5 wt% of Portland cement with silica fume. 

The use of pozzol an i c f i I lers, such as the more conventional natural pozzolans and fly ash and the advanced reactive silica fume and metakaolin can reduce the alkalinity of the matrix as well as the content of CH, and thus slow down the two processes which lead to the degradation in the properties of the composite chemical attack and microstructural changes at the interface (in particular deposition of CH). 

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