Amelioration Effect of Fly Ash and Powdered Ground Steel Slag for Improving Expansive Subgrade Soil

Table 1

The chemical characterization of materials used.

Composition	Expansive soil	Fly ash	GGBFS
SiO2	58.90	39.46	46.14
Al2O3	18.54	14.32	18.52
Fe2O3	8.40	5.38	13.24
CaO	0.90	24.28	16.76
MgO	1.62	3.34	2.29
Na2O	0.34	1.26	0.92
K2O	0.76	2.44	1.70
MnO	0.18	0.28	4.36
P2O5	0.04	1.25	0.82
TiO2	<0.01	0.04	0.07
H2O	2.05	0.11	0.16
LOI	9.28	7.04	3.13