Here, the soil is allowed to swell under a series of different vertical pressures (typically including the estimated overburden pressure). The engineer records the percent swell at each load. This method helps predict how much a foundation will heave under a specific structural load.
Measures the vertical strain resulting from wetting under a specific pressure other than the in-situ pressure.
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| Source | Description | Price (Approx.) | | :--- | :--- | :--- | | | The official publisher's store. Provides a secure, authoritative digital copy. | $86.00 | | Accuris (formerly Techstreet) | A major authorized distributor of engineering standards. | $54.00 | | ANSI Webstore | The official U.S. source for standards, including a complete back catalog. | Varies | | AFNOR Boutique | A French standards distributor that offers the ASTM standard in English. | Varies | Astm D4546-21 Pdf
This method is typically used for compacted fills . It measures wetting-induced swell or collapse on lab-compacted samples to simulate how a new fill will behave under future wetting.
Have you noticed a difference in your swell test results using the 2021 method versus the older standard? Let us know in the comments below.
The minimum vertical stress required to prevent a soil from expanding when wetted. Here, the soil is allowed to swell under
This directly determines the true zero-volume-change swell pressure of the soil. Technical Equipment Required
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Which specific parameter is your primary concern: , free swell index , or collapse potential ? Measures the vertical strain resulting from wetting under
After swelling stops, incremental loads are applied to compress the specimen back to its original volume or beyond.
An increase in soil thickness due to the absorption of water. Collapse or Hydrocompression:
PDF is vital for structural safety and cost mitigation. Engineers rely on these results to: