Study on Physical-Mechanical Properties and Microstructure of Expansive Soil Stabilized with Fly Ash and Lime

Table 2

Classification indicators of expansive soil.

Indicator	Swelling potential level
	Weak	Moderate	Strong
Liquid limit (%)	40–50	50–70	>70
Plasticity index	18–25	25–35	>35
Free swelling ratio (%)	40–65	65–90	>90
Total ratio of swelling-shrinkage (%)	0.7–2.0	2.0–4.0	>4.0