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| Assignment | Functional group | Movement | FTIR band (cm−1) | |
|---|---|---|---|---|
| O-H (in Portlandite) | Ca(OH)2 | O-H | O–H stretching mode in Portlandite, Ca(OH)2 | 3641 |
| SiO4 (in C-S-H) | CaO · SiO2 · H2O | SiO4 | Si–O stretching and Si–OH bending | 965 |
| C-O (in CaCO3) | CaCO3 | C–O | 1418, 873 |
