Utilization of Waste Incineration Bottom Ash to Enhance Engineering Properties of Expansive Subgrade Soils

Table 2

Chemical properties of subgrade soil.

Chemical composition		Weight
Name	Chemical formula	(%)
Silicon dioxide	O2Si	51.98
Aluminum oxide	Al2O3	1.91
Ferric oxide	Fe2O3	11.1
Calcium oxide	CaO	6.1
Phosphorus pentoxide	O5P2	3.8
Magnesium oxide	MgO	4.1
Dipotassium oxide	K2O	3.3
Titanium oxide	O2Ti	1.2
Disodium oxide	Na2O	1.4
Barium oxide	BaO	1.3
Strontium oxide	OSr	0.9
Manganese oxide	MnO	0.8