Research Article
Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials
Table 2
Oxide chemistry of cement, phosphate rock, and soil used in this study.
| | Oxide chemistry1 | Apatite (%) | Cement (%) | Soil (%) |
| | Calcium oxide (CaO) | 45.93 | 49.7 | — | | Aluminum oxide (Al2O3) | 1.23 | 9.87 | 15.40 | | Magnesium oxide (MgO) | — | 2.06 | — | | Phosphorus oxide (P2O5) | 25.10 | — | — | | Potassium oxide (K2O) | — | 0.75 | 1.89 | | Silicon oxide (SiO2) | 6.14 | 22.6 | 69.61 | | Ferric oxide (Fe2O3) | — | 3.50 | 4.90 | | Sulfate oxide (SO3) | — | 3.84 | — | | Sodium oxide (Na2O) | — | 0.24 | — | | Fluorine (F) | 2.35 | — | — | | Chlorine (Cl) | — | — | — | | Loss on ignition2 | 13.12 | 6.19 | 4.86 |
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1Mineral composition is analyzed by X-ray fluorescence method using ARL9800XP + XRF spectrometry. 2Value of loss on ignition is referenced to 950°C.
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