Deterioration and Microstructural Evolution of the Fly Ash Geopolymer Concrete against MgSO₄ Solution

Figure 7

XRD patterns of OPCC in the 60-day standard curing condition, heating condition, and 32-cycle MgSO₄ attack environment, respectively. Q: quartz; CH: calcium hydroxide; G: gypsum; C: C-S-H (calcium silicate hydrate).