The Effects of High Alkaline Fly Ash on Strength Behaviour of a Cohesive Soil

Table 1

The physicomechanical properties and the chemical composition of AC.

Index properties		Chemical composition (%)
Natural water content, (%)	30	SiO2	56.35
Natural unit weight, (kN^3)	17.5	Al2O3	12.7
Liquid limit, (%)	88.7	Fe2O3	5.37
Plasticity index, PI (%)	53.7	MnO	0.09
Specific gravity,	2.69	MgO	1.99
Gravel (%)	0.3	CaO	9.2
Sand (%)	14.5	Na2O	0.88
Silt (%)	37.2	K2O	1.37
Clay (%)	48	TiO2	0.81
Free swell index (%)	50	P2O5	0.12
% finer than number 200	89.8	LOI	11.12
Activity,	1.12
Mechanical properties
Cohesion (kPa)	13.9
Internal friction angle (°)	10.7
California bearing ratio (CBR, %)	6.7