ASTM D4546-21 defines laboratory methods for measuring one-dimensional, wetting-induced swell or collapse of soils to evaluate ground movement. The standard outlines three methods—Method A, B, and C—to determine parameters such as swell pressure, free swell, and consolidation under specific loading conditions. For technical details and to purchase the standard, visit the official ASTM International
: Used for reconstituted specimens simulating compacted fills. It measures swell pressure and free swell by applying different loads to identical specimens before wetting. astm d454621 pdf
By following the ASTM D4546-21 protocol, engineers can quantify these risks and design structures to accommodate or mitigate them, saving millions in potential repairs. astm d454621 pdf