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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