Table 1 Physical properties and chemical composition of materials.
Property | Fly ash | Bentonite | Chemical composition | Fly ash | Bentonite |
|---|---|---|---|---|---|
Specific gravity (G) | 2.07 | 2.82 | SiO2 | 47.5 | 58.2 |
Particle size characteristics (%) | Al2O3 | 26.1 | 15.4 | ||
Fine sand (0.425–0.075 mm) | 25 | 7 | Fe2O3 | 8.4 | 3.3 |
Silt size (0.075–0.002 mm) | 75 | 44 | CaO | 0.9 | 0.2 |
Clay size (0.02 mm) | 0 | 49 | MnO | 0.2 | 1.3 |
Atterberg limits (%) | MgO | 0.3 | 5.6 | ||
Liquid limit | Non-plastic | 224 | Loss on ignition | 2.3 | - |
Plastic limit | – | 31 | Others | 14.3 | 16 |
Plasticity index | – | 193 | |||
Classification | Class F | CH | |||
Specific surface area (m2/g) | 1.4 | 219 | |||
Cation exchange capacity (meq/100 g)* | 1.23 | 56.9 | |||
Sample minerals | Quartz, Mullite Magnetite | Quartz, Illite, Montmorillonite, Kaolinite |
