Public test guide

Double oedometer

Compares matching soil specimens tested at different moisture conditions to assess wetting-related settlement behaviour.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

Two comparable specimens are loaded in oedometers, commonly with one tested near natural moisture and the other inundated.

Paired representative specimens, two oedometer setups, water supply, loading frames and displacement gauges.

The difference in compression response associated with wetting and loading.

Supports assessment of potentially collapsible or moisture-sensitive soils beneath foundations and earthworks.

Typical test sequence

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