From: Occurrence of shale soils along the Calabar-Itu highway, Southeastern Nigeria and their implication for the subgrade construction
Seed et al. (1962) Sa
Ola (1982)
Plasticity index (PI) (%)
Ramana (1993)
Liquid limit (LL) (%)
Terzaghi et al. (1996)
Plasticity index
Expansive potential
0–1.567
0–15
<50
0–10
Low
1.567–5.45
15–25
50–70
10–20
Medium
5.45–12.39
25–35
71–90
20–35
High
>12.39
>35
>90
Very high
