Review Article
Effect of Agricultural Crop Wastes as Partial Replacement of Cement in Concrete Production
Table 5
Chemical compositions of rice husk ashes (RHA).
| Authors | Chemical compositions (oxides %) | SiO2 + Al2O3 + Fe2O3 | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | K2O | Na2O | LOI |
| Khan et al. [56] | 86.80 | 0.895 | 2.435 | 0.45 | 0.55 | — | — | — | 2.5 | 90.08 | Antiohos et al. [57] | 86.50 | 0.92 | 0.56 | 1.12 | 1.30 | 0.05 | 1.58 | 0.43 | 6.3 | 87.98 | Raheem and Kareem [58] | 82.14 | 1.34 | 1.27 | 1.21 | 1.37 | 0.17 | 2.09 | 0.14 | — | 84.75 | Zareei et al. [59] | 86.70 | 0.04 | 0.61 | 0.39 | 1.32 | 9.8 | 0.01 | — | — | 87.38 | Krishna et al. [60] | 76.8 | 0.41 | 1.045 | 0.93 | 0.27 | — | 2.64 | 0.1 | — | 78.22 | Abiodun and Jimoh [61] | 61.33 | 2.20 | 8.43 | 6.53 | 2.33 | — | 11.90 | 2.53 | — | 71.97 | Salas et al. [62] | 90.00 | 0.68 | 0.42 | 8.14 | 0.35 | — | — | 0.32 | — | 91.10 | Faried et al. [13, 16] | 70.36 | 1.54 | 0.68 | 4.51 | 1.35 | 3.23 | 8.73 | 1.09 | | 72.58 |
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