Research Article
Utilizing Coal Bottom Ash from Thermal Power Plants in Vietnam as Partial Replacement of Aggregates in Concrete Pavement
Table 1
Chemical and mineral composition of An Khanh CBA, Cao Ngan CBA and Cement.
| Composition | Properties | An Khanh CBA | Cao Ngan CBA | Cement PCB40 | Content (%) |
| Chemical composition | SiO2 | 60.12 | 37.5 | 20.32 | Fe2O3 | 24.93 | 11.93 | 3.30 | Al2O3 | 2.30 | 2.70 | 5.00 | SO3 | 0.77 | 8.76 | 1.15 | CaO | 1.30 | 19.67 | 62.5 | MgO | 3.71 | 1.25 | 0.13 | K2O | 0.34 | 1.66 | 0.75 | Na2O | 0.30 | 0.05 | 0.26 | Loss of ignition | 3.99 | 12.47 | | Alkaline index | 0.08 | 0.52 | | Activity index, Al2O3/SiO2 | 0.038 | 0.072 | | CaO + MgO | 5.01 | 20.92 | |
| Mineral composition | Mica | 14–16 | 14–16 | | Pyrophyllite | 5–7 | — | | Gypsum | — | 14–16 | | Quartz | 47–49 | 20–22 | | Calcite | 1–3 | 13–15 | | Goethite | 4–6 | — | | Hematite | 4–6 | 5–7 | | Other | 4% feldspat, amorphous substance | 24% anhydride | | C3S | | | 51.1 | C2S | | | 25.0 | C3A | | | 8.1 | C4AF | | | 10.0 |
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