Fabrication and properties of foam geopolymer using circulating fluidized bed combustion fly ash
In recent years, circulating fluidized bed combustion fly ash (CFA) is used as a raw material for geopolymer synthesis. Hydrogen peroxide was employed as a foaming agent to prepare CFA-based foam geopolymer. The particle distribution, mineral composition, and chemical composition of CFA were examined firstly. Geopolymerization products were characterized by mechanical testing, scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray fluorescence (XRF). The CFA-based foam geopolymer was successfully fabricated with different contents of hydrogen peroxide and exhibited uncompleted alkali reaction and reasonable strength with relative low atomic ratios of Si/Al and Si/Na. Type-C CFA in this research could be recycled as an alternative source material for geopolymer production.
Keywordsfly ash geopolymers foamed products microstructure hydrogen peroxide
Unable to display preview. Download preview PDF.
- J. Davidovits, Geopolymer Chemistry and Applications, Institut Géopolymère, Saint-Quentin, 2008, p. 592.Google Scholar
- H. Xu, Geopolymerisation of Alumino-Silicate Minerals [Dissertation], The University of Melbourne, Melbourne, 2002, p. 297.Google Scholar
- P. Sun, Fly Ash Based Inorganic Polymeric Building Material [Dissertation], Wayne State University, Detroit, 2005, p. 216.Google Scholar
- J.L. Bell and W.M. Kriven, Preparation of ceramic foams from metakaolin-based geopolymer gels, Ceram. Eng. Sci. Proc., 29(2009), No. 10, p. 97.Google Scholar
- E. Álvarez-Ayuso, X. Querol, F. Plana, A. Alastuey, N. Moreno, M. Izquierdo, O. Font, T. Moreno, S. Diez, E. Vazquez, and M. Barra, Environmental, physical and structural characterisation of geopolymer matrixes synthesised from coal (co-)combustion fly ashes, J. Hazard. Mater., 154(2008), p.175.CrossRefGoogle Scholar