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.
provides the laboratory testing procedures used to measure the magnitude of one-dimensional wetting-induced swell or collapse (hydrocompression) of unsaturated soils. astm d454621 pdf
The standard outlines two test methods for determining the relative density of soil: By following the ASTM D4546-21 protocol, engineers can
: This method involves using a double-ring infiltrometer to assess the rate at which water moves into the soil. It's particularly useful for understanding infiltration rates at the soil surface. The specimen is loaded to a specific stress (e
It provides three distinct methods for measuring how soil volume changes when subjected to wetting under a specified vertical pressure. This is critical for evaluating soils that are susceptible to sudden settlement when they become saturated—a phenomenon known as "hydrocompression" or "collapse."
: Used for intact specimens from natural deposits or existing fills. The specimen is loaded to a specific stress (e.g., in-situ overburden) and then wetted.