A highway project crossed a dry alluvial fan. Collapse tests per ASTM D4546-21 Method C showed 12% collapse upon wetting. The engineers treated the soil with deep dynamic compaction before paving. Ten years later, a flood event caused zero settlement on the treated section. An adjacent untreated section sank 18 inches.
A predetermined seating pressure or vertical stress is applied to the sample.
Understanding ASTM D4546-21: The Standard Test Methods for One-Dimensional Swell or Collapse of Soils
Geotechnical projects must account for two major hazards hidden within unsaturated or partially saturated soils: Astm D4546-21 Pdf
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to simulate compacted fills. It measures one-dimensional swell or hydrocompression (collapse) and is often used to determine swell pressure (the stress needed to stop swelling) and free swell (percent swell under a nominal 1 kPa load). Test Method B : Similar to Method A but uses intact specimens
A soil sample is subjected to a specific seating load (typically 1–5 kPa). It is then saturated and allowed to swell or collapse freely while keeping the load constant. A highway project crossed a dry alluvial fan
When constructing slab-on-grade foundations or shallow footings in arid or semi-arid regions, knowing the swell pressure allows structural engineers to design foundations heavy or rigid enough to resist uplifting forces. Infrastructure and Pavements
Updated units of measurement and improved guidance on significant digits.
Natural soil samples from field sites (undisturbed). Ten years later, a flood event caused zero
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Originally published in 1985, D4546 is the definitive American standard for measuring the swell or collapse potential of compacted or undisturbed soils. It simulates what happens when a soil’s moisture content increases under a given vertical pressure (load).