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. 2020 Apr 9;13(7):1750. doi: 10.3390/ma13071750

Figure 7.

Figure 7

The micromorphology of selected geopolymer foam specimens: (a) without CFA addition, before the fire-resistance test; (b) 12% CFA addition, before the fire-resistance test; (c) 12% CFA addition, before the fire-resistance test; (d) without CFA addition, after the fire-resistance test; (e) 12% CFA addition, after the fire-resistance test; (f) 12% CFA addition, after the fire-resistance test.