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Table 6 Expansive soil classification based on shrinkage limit

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

Swell potential (Holtz and Gibbs 1956) Shrinkage limit (%) Volume change (Altmeyer 1956) Shrinkage limit (%)
Low > 15 Non-critical > 12
Medium 10–16 Marginal 10–12
High 7–12 Critical < 10
Very high < 11 Volume change Shrinkage limit (%)