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Optical microscopy and SEM characterization of fly ash geopolymers produced with different amounts of H2O2 as foaming agent ((a) and (f) 0.03 wt. %, (b) and (g) 0.15 wt. %, (c) and (h) 0.30 wt. %, (d) and (i) 0.90 wt. % and (e) and (j) 1.20 wt. %). Reprinted from Reference [42], © 2020, with permission from Elsevier.
