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Table 5 Expansive soil classification based on plasticity index and Liquid

From: An investigation into the cause of road failure along Sagamu-Papalanto highway southwestern Nigeria

Swell potential

Plasticity index (%)

  

Swell potential

Liquid limit (%)

  

Holtz and Gibbs (1956)

Chen (1988)

IS:1498 (1970)

 

Chen (1965)

Snethan et al. (1977)

IS: 1498 (1970)

 

Low

< 18

0–15

< 12

Low

< 30

< 50

35–50

Medium

15–28

10–35

12–23

Medium/marginal

30–40

50–60

50–70

High

25–41

20–55

23–32

High

40–60

> 60

70–90

    

Very high

> 60

–

20–35