Surface composition of wet-stored fly ash at different pH (10% moisture, 20°C, 120 days) by EDX: % by mass
| Element | Dry | DFA1 – pH solution | Dry | DFA3 – pH solution | ||||
|---|---|---|---|---|---|---|---|---|
| 4.0 | ≈7.0 | 11.5 | 4.0 | ≈7.0 | 11.5 | |||
| C | 19.4 | 19.4 | 19.4 | 19.4 | 17.1 | 17.1 | 17.1 | 17.1 |
| O | 49.8 | 44.6 | 50.0 | 46.7 | 48.8 | 42.9 | 43.8 | 46.1 |
| Al | 8.2 | 8.0 | 7.4 | 7.5 | 9.2 | 8.4 | 8.7 | 7.4 |
| Si | 16.3 | 17.1 | 13.3 | 15.4 | 15.7 | 16.6 | 16.8 | 15.9 |
| K | 1.4 | 1.7 | 1.6 | 1.7 | 2.3 | 2.0 | 1.9 | 1.4 |
| Ca | 2.0 | 3.7 | 3.9 | 3.9 | 2.1 | 4.2 | 2.1 | 3.2 |
| Fe | 3.0 | 4.9 | 4.0 | 5.5 | 4.3 | 5.4 | 6.3 | 6.5 |
| Ti | ND | 0.7 | ND | ND | ND | 0.5 | 0.7 | ND |
| Mg | ND | ND | 0.6 | ND | ND | 0.6 | 0.7 | ND |
| S | ND | ND | ND | ND | 0.6 | 1.1 | 0.6 | 1.5 |
| Na | ND | ND | ND | ND | ND | 1.2 | 1.3 | 1.1 |
| 4.0 | ≈7.0 | 11.5 | 4.0 | ≈7.0 | 11.5 | |||
|---|---|---|---|---|---|---|---|---|
| C | 19.4 | 19.4 | 19.4 | 19.4 | 17.1 | 17.1 | 17.1 | 17.1 |
| O | 49.8 | 44.6 | 50.0 | 46.7 | 48.8 | 42.9 | 43.8 | 46.1 |
| Al | 8.2 | 8.0 | 7.4 | 7.5 | 9.2 | 8.4 | 8.7 | 7.4 |
| Si | 16.3 | 17.1 | 13.3 | 15.4 | 15.7 | 16.6 | 16.8 | 15.9 |
| K | 1.4 | 1.7 | 1.6 | 1.7 | 2.3 | 2.0 | 1.9 | 1.4 |
| Ca | 2.0 | 3.7 | 3.9 | 3.9 | 2.1 | 4.2 | 2.1 | 3.2 |
| Fe | 3.0 | 4.9 | 4.0 | 5.5 | 4.3 | 5.4 | 6.3 | 6.5 |
| Ti | ND | 0.7 | ND | ND | ND | 0.5 | 0.7 | ND |
| Mg | ND | ND | 0.6 | ND | ND | 0.6 | 0.7 | ND |
| S | ND | ND | ND | ND | 0.6 | 1.1 | 0.6 | 1.5 |
| Na | ND | ND | ND | ND | ND | 1.2 | 1.3 | 1.1 |
ND, not detected
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