is the current standard test method for measuring the One-Dimensional Swell or Settlement Potential of Cohesive Soils . It provides procedures for determining the magnitude of swell or settlement of relatively undisturbed or compacted cohesive soils when they are inundated with water. Overview of ASTM D4546-21
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The standard outlines specific procedures based on the project requirements: ASTM D4546-21 is the current standard test method
One of the most misunderstood parts of D4546-21 is the shift toward strain-controlled readings. Older engineers sometimes rely on time-controlled readings (e.g., check the dial gauge every 24 hours). While "PDF" is a common search term for
This method uses soil that has been remolded to simulate the conditions of a compacted fill. It involves testing multiple specimens under different loads to determine free swell (expansion under minimal pressure) and swell pressure (the force needed to stop expansion entirely).