| α-Fe2O3 | Hematite nanoparticles |
| OPC | Ordinary Portland Cement |
| FA | Fly ash |
| C3A | Tricalcium aluminate or 3CaO.Al2O3 |
| C3S | Alite or 3CaO.SiO2 |
| C2S | Belite or 2CaO.SiO2 |
| C-S-H gel | Calcium-silicate-hydrate gel |
| CAS− | Calcium sulfoaluminate or Ca4Al2(SO4)(OH)12.6H2O |
| C4AF | Ferrite phase or 4CaO.Al2O3.Fe2O3 |
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