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Table 3 Expansive soil classification based on plasticity index

From: Characterization of structural failures founded on soils in Panyam and some parts of Mangu, Central Nigeria

Swell Potential

Plasticity Index (%)

Holtz and Gibbs (1956)

Chen (1988)

Low

<  18

0–15

Medium

15–28

10–35

High

25 – 41

20–55

Very High

>  35

>  35