Research Article
The Effects of High Alkaline Fly Ash on Strength Behaviour of a Cohesive Soil
Table 1
The physicomechanical properties and the chemical composition of AC.
| Index properties | | Chemical composition (%) |
| Natural water content, (%) | 30 | SiO2 | 56.35 | Natural unit weight, (kN3) | 17.5 | Al2O3 | 12.7 | Liquid limit, (%) | 88.7 | Fe2O3 | 5.37 | Plasticity index, PI (%) | 53.7 | MnO | 0.09 | Specific gravity, | 2.69 | MgO | 1.99 | Gravel (%) | 0.3 | CaO | 9.2 | Sand (%) | 14.5 | Na2O | 0.88 | Silt (%) | 37.2 | K2O | 1.37 | Clay (%) | 48 | TiO2 | 0.81 | Free swell index (%) | 50 | P2O5 | 0.12 | % finer than number 200 | 89.8 | LOI | 11.12 | Activity, | 1.12 | | |
| Mechanical properties | | | |
| Cohesion (kPa) | 13.9 | | | Internal friction angle (°) | 10.7 | | | California bearing ratio (CBR, %) | 6.7 | | |
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