Table 3: Chemical properties of fly ash.

Sl. numberTest conductedObserved values (%)Requirement as per IS: 1320-1981

1Loss of ignition2.325.0 (max)
2Silica as SiO242.04SiO2 + Fe2O3 + Al2O3 = 70
3Iron as Fe2O34.40
4Alumina as Al2O333.60
5Calcium as CaO12.73
6Magnesium as MgO0.005.0 (max)
7Sulphate as SO30.403.0 (max)
8Lime reactivity4 N/mm24.5 (max)