Synthesis and Characterization of Porous Fly Ash-Based Geopolymers Using Si as Foaming Agent

Figure 2

XRD patterns of fly ash and selected Si foamed geopolymers. 1: quartz (PDF: 46-1045), 2: albite (PDF: 20-0554), 3: anhydrate (PDF: 03-0377), 4: maghemite (PDF: 04-0755), 5: ghelenite (PDF: 04-0690), 6: cristobalite (PDF: 03-0276), 7: hydroxysodalite (PDF: 89-9098), 8: hydroxycancrinite (PDF: 31-1272), 9: natrite (PDF: 37-0451), 10: calcite (PDF: 47-1743), 11: potassium carbonate (PDF: 70-0292), 12: sodium bicarbonate (PDF: 15-0475), and 13: potassium bicarbonate (PDF: 70-0995).