Research Article
Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars
Table 6
FTIR assignments (wavenumber in cm−1) for the FS50 and FF50 mixtures at 90 days.
| | Assignments | FS50 | FF50 |
| | Hydrogen bonds O-H (Ca(OH)2) (stretching vibration) | 3647 | — | | Hydrogen bonds O-H (H2O) (stretching vibration) | 3401 | 3427 | | HOH (bending vibration) | 1626 | 1612 | | Carbonates, O-C-O (stretching vibration) | 1410 | 1407 | | Sulphates, SO4 = (anhydrite) | 1103 | 1144/1092 | | Si-O (C-S-H) (stretching vibration) | 965 | 971 | | Carbonates, O-C-O (stretching vibration) | 874/711 | 872/711 | | Si-O-Si, Si-O-Si/Si-O-Al (bending vibration) | 663, 602 | 661, 600 | | Si-O (SiO4) (bending vibration) | 464 | 471 |
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