Characterization of various fly ashes for preparation of geopolymers with advanced applications

Fly ashes from different power stations in Australia (Collie, Eraring, Tarong) and Mongolia (4th thermal power station, Ulaanbaatar city) have been characterized by various techniques. It was determined that the Australian fly ashes are class F while the Mongolian fly ashes are class C. Due to their chemical and mineralogical differences, the fly ashes behaved differently when alkali activated to make geopolymers. The influence of various parameters on the preparation of geopolymers have been investigated and the results are used to establish a procedure for the routine manufacture of alkaline activated products. The applicability of using fly ash for building structural elements, corrosion resistant and thermally resistant materials will be presented.

Collie fly ash based raw (A), 600 °C (B) and 1000 °C (C) calcined geopolymers.Figure optionsDownload as PowerPoint slideHighlights
► Chemical and mineralogical compositions of source fly ash characterized its application.
► Thermal and chemical resistances of the geopolymers can be improved by calcination at moderate temperature.
► Surface modified geopolymers have a potential for construction application in chemical aggressive medium.