Materiales de Construcción, Vol 54, No 275 (2004)

''Geopolymers": same basic chemistry, different microstructures


https://doi.org/10.3989/mc.2004.v54.i275.249

A. Palomo
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

A. Fernández-Jiménez
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

M. Criado
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

Abstract


The present paper describes the effect of certain working variables on the microstructural evolution of oven-dried, alkali-activated fly ash. The results show that the main reaction product in the activation process (in all the systems studied) is an amorphous aluminosilicate gel with a three-dimensional structure. Nonetheless, the type and concentration of the activator used as well as the natural ageing of the materials and origin of the prime materials were also found to have a substantial impact on microstructural development in the "geopolymers " synthesised, particularly from the morphological standpoint.

Keywords


fly ash; metakaolin; alkaline activation; microstructure

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