An Experimental Study on the Geotechnical, Mineralogical, and Swelling Behavior of KPK Expansive Soils

Table 4

Initial and expansion-based classification of the selected expansive soils.

Soil sample	Pl (%)	USCS	Expansivity	Chen criteria
Karak	37	CH	High	PI = 10–15
				Low
D.I Khan	23	CL	Medium	PI = 15–28
				Medium
Kohat	30.5	CH	High	PI = 28–41
				High