| Elemental composition | CEM I 52.5R | Limestone |
| CaO | 69% | 48% |
| SiO2 | 25% | 6% |
| Al2O3 | 2.1% | 1.0% |
| Fe2O3 | 0.3% | 0.6% |
| MgO | 0.7% | 3.6% |
| SO3 | 0.3% | - |
| Ignition loss | <1% | 40% |