Table 4.
Composition quantified using TOPAS (v.5 Bruker) for a sample of fly ash and a sample of geopolymer from batch 2 of Table 3. The values for fly ash (a) and geopolymer (a) have been determined from a sample rotating at 30 rpm and using a knife edge collimator. The values for fly ash (b) and geopolymer (b) have been determined from a sample which was not rotating and a knife edge collimator was not used. Rwp is the weighted profile R factor.
| Phase Content | Mullite [%] | Quartz [%] | Magnetite [%] | Hematite [%] | Amorphous content [%] | Gypsum [%] | Rwp | |
|---|---|---|---|---|---|---|---|---|
| Sample | ||||||||
| Fly ash (a) | 13.74 | 2.30 | 1.24 | 0.67 | 80.02 | 1.97 | 3.9 | |
| Geopolymer (a) | 9.18 | 2.09 | 0.89 | 0.39 | 86.15 | 1.30 | 3.0 | |
| Fly ash (b) | 15.68 | 3.48 | 1.25 | 1.34 | 76.65 | 1.36 | 2.4 | |
| Geopolymer (b) | 12.13 | 2.75 | 1.05 | 0.80 | 82.12 | 1.20 | 2.2 | |