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Table 8 Classification of swelling potential

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 >35 Very high
  1. aS = (2.116 × 10−3) (PI)2.44