Strength and Microfabric of Expansive Soil Improved with Rice Husk Ash and Lime

Table 1

Chemical compositions of raw materials.

	Chemical composition (%)
	Soil	RHA	Lime
SiO2	58.7	72.3	0.1
CaO	5.8	1.5	92.3
Al2O3	18.4	4.4	0.6
Fe2O3	7.1	1.2	0.5
K2O	3.5	3.5	0
MgO	2.0	1.0	0
Na2O	1.1	0.8	0.3