Research Article
Effect of Hybrid Steel-Basalt Fiber on Behaviors of Manufactured Sand RPC and Fiber Content Optimization Using Center Composite Design
Table 2
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 | 95 | | Loss on ignition (%) | ≤6.0 | 1.95 | | Cl− (%) | ≤0.02 | 0.02 | | Moisture content (%) | ≤3.0 | 1.2 | | Water demand ratio (%) | ≤125 | 118 |
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