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

Figure 8

Pore size distribution of Si samples in relation to the R/Al molar ratio (a, b, and c) and the foaming agent content (d, e, and f). (a) exp. 5 (R/Al = 0.8, Si = 0.085%); (b) exp. 6 (R/Al = 1.2, Si = 0.085%); (c) exp. 8 (R/Al = 2.0, Si = 0.085%); (d) exp. 1 (R/Al = 0.8, Si = 0.050%); (e) exp. 5 (R/Al = 0.8, Si = 0.085% w/w); (f) exp. 13 (R/Al = 0.8, Si = 0.150% w/w).

(a)

(b)

(c)

(d)

(e)

(f)