Research Article
Utilization of Sandy Soil as the Primary Raw Material in Production of Unfired Bricks
Table 1
The chemical compositions and the physical properties of OPC, GGBS, and sandy soil.
| | Chemical composition (wt.%) | Cement (OPC) | GGBS | Sandy soil |
| | CaO | 62.25 | 37.04 | 8.54 | | SiO2 | 20.58 | 32.90 | 68.73 | | Al2O3 | 5.64 | 15.36 | 11.33 | | Fe2O3 | 3.95 | 2.46 | 3.82 | | MgO | 2.48 | 10.18 | 3.02 | | Na2O | 3.18 | 1.12 | 1.46 | | K2O | 0.36 | 0.15 | 2.00 | | SO3 | 0.32 | 0.08 | 0.05 | | TiO2 | — | — | 0.65 | | Loss on ignition | — | 0.38 | — | | Physical properties | | Specific gravity (g/cm3) | 3.10 | 2.84 | 2.33 | | Specific surface (m2/kg) | 365 | 425 | — | | Initial setting time (min) | 138 | — | — | | Final setting time (min) | 204 | — | — | | Fineness modulus | — | — | 0.82 |
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