ASTM D4546-21 defines three distinct laboratory methods tailored to different soil types and project needs:
The test assumes vertical movement only, simulating the behavior of soil confined laterally in the field.
The primary objective of this standard is to quantify the potential for soil to expand or settle when it becomes saturated. This is critical for infrastructure projects on expansive or collapsible soils, where unpredicted volume changes can lead to severe structural damage.
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