Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Table 1

Properties of natural black cotton expansive soil.

Type of test	Test method	Result
Depth of sampling (m)	1.5–2	—
Natural moisture content (%)	ASTM D2216	12
Linear shrinkage (%)	ASTM D4943	23.4
Grain size analysis
Clay	ASTM D422	73.6
Silt		22.42
Sand		3.05
Gravel		0.93
Atterberg limits
Liquid limit	ASTM D4318	87
Plastic limit		38.1
Plasticity index		49
Classification of soil
AASHTO	—	A-7-5
USCS		CH
Specific gravity
Gs (g (cm)^2)	ASTM D854	2.71
Swell characteristics
Free swell percent	IS 2720	110
Standard compaction
MDD (g (cm)^3)	ASTM D698	1.27
OMC (%)		33
Soaked CBR value (%)	T193	1.7
Color	—	Black