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Physical and chemical properties of silica fume.
| Properties | Standard Value | Actual Value | |
|---|---|---|---|
| Physical properties | Specific surface area (m2/kg) | ≥15 | 20 |
| Pozzolanic activity index (%) | ≥85 | 116 | |
| Chemical properties | SiO2 (%) | ≥85.0 | 94.5 |
| Loss on ignition (%) | ≤6.0 | 2.5 | |
| Cl− (%) | ≤0.02 | 0.02 | |
| Moisture content (%) | ≤3.0 | 1.2 | |
| Water demand ratio (%) | ≤125 | 118 | |
