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XRD patterns of (a) soil based geopolymer, (b) soil based geopolymer with fly ash, (c) soil based geopolymer with GGBS, and (d) soil based geopolymer with fly ash and GGBS at optimum S/L ratio. Q: quartz (ICCD reference: 01-089-1961); Hm: hematite (ICDD reference: 00-024-0072); Ms: muscovite (ICCD reference: 00-001-1098); Ak: akermanite (ICDD reference: 00-035-0592); G: gypsum (ICDD reference: 00-033-0311); L: Larnite (ICDD reference: 00-031-0299).
