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This method explains how to make expansion tests on undisturbed or compacted clay soil samples that have no particle sizes greater than 3/16 in. (passing the No. 4 standard ASTM sieve). The test is made to determine (1) magnitude of volume change under load or no-load conditions, (2) rate of volume change, (3) influence of wetting on volume change, and (4) axial permeability of laterally confined soil under axial load or no-load during expansion. Saturation (no drainage) takes place axially. Permeant water is applied axially for determining the effect of saturation and permeability. The specimens prepared for this test may also be used to determine the vertical or volume shrinkage as the water content decreases. Total volume change for expansive soils is determined from expansion plus shrinkage values for different ranges of water content.
Consulting Civil Engineer, Denver, Colo.