Research Article
Pozzolanic Effect on the Hydration Heat of Cements Incorporating Fly Ash, Obsidian, and Slag Additives
Table 2
A summary of oxide analysis of additives utilized in the experiments (%).
| Oxides | CEM I 42.5R | Obsidian | Fly ash | Blast furnace slag |
| CaO | 63.52 | 0.75 | 3.85 | 31.23 | SiO2 | 18.48 | 71.56 | 51.65 | 37.58 | Al2O3 | 5.25 | 12.52 | 17.65 | 10.52 | Fe2O3 | 3.48 | 1.53 | 11.51 | 0.63 | MgO | 1.01 | 0.17 | 4.62 | 8.06 | K2O | 1.13 | 5.21 | 2.05 | 1.53 | Na2O | 0.36 | 3.95 | 0.65 | 0.35 | P2O5 | 0.071 | 0.011 | 0.112 | 0.002 | SO3 | 2.775 | 0.003 | 1.25 | 3.57 | TiO2 | 0.13 | 0.17 | 0.68 | 0.41 | Sr | 0.075 | 0.012 | 0.013 | 0.061 | Cr2O3 | 0.06 | 0.065 | 0.11 | 0.13 | MnO | 0.25 | 0.05 | 0.12 | 1.25 | Loss on ignition | 2.76 | 2.02 | 2.13 | 1.12 | Reactive silica | - | 39.34 | 47.13 | 43.01 |
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