| Chemical Composition (%) | Ordinary Portland Cement | Fly Ash |
|---|---|---|
| SiO2 | 12.1 | 36.4 |
| Al2O3 | 1.93 | 14.1 |
| Fe2O3 | 4.18 | 22.4 |
| CaO | 75.9 | 17.5 |
| MgO | 1.03 | 2.55 |
| Na2O | - | 0.231 |
| K2O | 0.486 | 2.09 |
| SO3 | 3.44 | 1.04 |
| SiO2 + Al2O3 + Fe2O3 | 18.21 | 72.9 |
| Specific Gravity | 3.0883 | 2.7767 |
| Loss of ignition | 1.1 | 1.49 |