Research Article
Effect of Desliming of Tailings on the Fresh and Hardened Properties of Paste Backfill Made from Alkali-Activated Slag
Table 2
Chemical, physical, and mineralogical properties of binders.
| Chemical composition | OPC (wt.%) | Slag (wt.%) | Physical properties | OPC | Slag |
| SiO2 | 21.88 | 39.75 | Specific gravity | 3.07 | 2.89 | Al2O3 | 4.74 | 10.91 | Specific surface area (cm2/g) | 4120 | 4600 | Fe2O3 | 2.90 | 0.80 | Retained on 45 μm sieve (%) | 2.17 | 4.15 | CaO | 65.0 | 38.02 | Retained on 32 μm sieve (%) | 7.48 | 9.60 | MgO | 1.40 | 5.92 | Mineralogical composition (%) | TiO2 | 0.19 | 0.51 | C3S | 50.42 | – | Cr2O3 | 0.01 | 0.01 | C2S | 27.76 | – | Na2O | 0.39 | 0.32 | C3A | 7.66 | – | K2O | 0.75 | 1.19 | C4AF | 8.83 | – | MnO | 0.12 | 1.54 | Basicity index | P2O5 | 0.06 | <0.01 | | – | 1.03 | Free lime | 1.04 | – | | | | Loss on ignition | 2.5 | 0.20 | | | | SO3 | 2.67 | 1.62 | | | | Reactive SiO2 | – | 39.10 | | | |
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