Band, cm−1 | Phase | Relative intensity | Reference | |||||
OPC | Unfired | 300˚C | 450˚C | 600˚C | 750˚C | |||
518 | C2S (O-Si-O) | Vs | W | s | s | s | s | [50] [51] |
937 | C3S (Si-O) | Vs | W | m | m | s | s | [50] [51] |
975 | C-S-H (O-Si-O) | - | Vs | s | m | - | - | [50] |
1115 | Ettringite ( ) | - | M | m | m | m | m | [49] |
1144 | Gypsum ( ) | Vs | - | - | - | - | - | [49] |
1432 | Calcite ( ) | Vs | M | s | m | m | w | [52] |
1637, 3455 | Free water (OH−) | - | S | vs | m | w | w | [53] |
3642 | Portlandite (OH−) | vw | S | vs | m | w | w | [50] |