: To estimate the amount of vertical movement (heave or settlement) a soil layer might undergo due to changes in moisture content.
The biggest changes in the 2021 edition include: Astm D4546-21 Pdf
. Multiple specimens are reconstituted to duplicate the density of the fill material and wetted under varying vertical loads to determine swell pressure (the stress required to prevent swelling) and free swell (expansion under a minimal seating pressure of 1 kPa). Test Method B (Intact Specimens): Primarily used for natural soil deposits : To estimate the amount of vertical movement
Measures the amount of vertical strain (percent swell) that occurs when a specimen is inundated under a specific constant pressure. Test Method B (Intact Specimens): Primarily used for
: Measures the swell or settlement under various loading stages, similar to a standard consolidation test but with inundation at a specific point. Key Updates in the 2021 Version