Research Article
The Compressive Strength of High-Performance Concrete and Ultrahigh-Performance
Table 1
Physical properties and chemical analyses of cements C and silica fume.
| Description of tests | Portland cement (CPA CEM 52.5) | Silica fume |
| Mortar strength | | | Compressive strength at: | | | 2-days | 35 MPa | — | 7-days | 50 MPa | — | 28-days | 62 MPa | |
| Chemical analysis | | | SiO2 | 19.8% | 89% | Al2O3 | 5.14% | 0.3% | Fe2O3 | 2.3% | 0.6% | CaO, total | 64.9% | 0.3% | MgO | 0.9% | 1.1% | SO3, total | 3.4% | 0.2% | K2O | 1.1% | 1.6% | Na2O | 0.05% | 0.6% | Si | — | 3.2% | Loss on ignition | 1.1% | 2.7% | Insoluble residue | 0.2% | — |
| Compound composition | | | C3S | 58% | | C2S | 13% | | C3A | 10% | | C4AF | 7% | |
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