If you have just downloaded the PDF, here is a high-level summary of the procedure for Method A (the most common):
Equipment Needed:
Procedure:
Typical Results:
To appreciate the value of your PDF, you must know where D4546-21 fits in the geotechnical testing landscape.
| Standard | Focus | Key Difference from D4546-21 | | :--- | :--- | :--- | | ASTM D4546-21 | Swell/Collapse (wetting under load) | Measures volume change during saturation. | | ASTM D2435 | Standard Consolidation | Measures compression without saturation. | | ASTM D5333 | Collapse Potential (another method) | Older, less common method. D4546 is preferred. | | ASTM D2166 | Unconfined Compression | Measures strength, not volume change. |
Note: Many engineers mistakenly use D2435 for collapse testing. D4546-21 is the correct standard because it specifically addresses the reduction in volume due to wetting. astm d454621 pdf
| Feature | ASTM D4546 (HPLC-UV) | ASTM D2622 (XRF) | ASTM D5453 (UV Fluorescence) | | :--- | :--- | :--- | :--- | | Primary Output | Speciation (identifies individual compounds) | Total Sulfur only | Total Sulfur only | | Sensitivity | High | Moderate | Very High | | Interferences | Low (due to separation) | Potential matrix effects | Quenching effects | | Cost | Moderate | High | High |
Why choose D4546? The unique selling point of ASTM D4546 is Speciation. While other methods give a total "bulk" sulfur number, D4546 can distinguish between different types of sulfur (e.g., thiophenes, sulfides, mercaptans). This is vital for refinery engineers who need to know which sulfur compounds are present to optimize the hydrotreating process.
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ASTM D4546-21 is the standard test method titled "Standard Test Methods for One-Dimensional Swell or Collapse of Soils."
Published by ASTM International, this standard provides the guidelines used to determine the magnitude of the swell or collapse potential of a soil specimen. Essentially, it helps engineers predict if soil will expand when it gets wet (swell) or if it will settle and compact (collapse).
This data is vital for foundation design, pavement structures, and preventing structural failure. Procedure:
If you are using an older version of the standard (such as D4546-14 or D4546-08), it is crucial to upgrade to the -21 version. Standards are regularly updated to reflect new technologies, improved precision, and editorial corrections.
Using the most current version ensures that your lab testing complies with the latest industry best practices and that your data is legally and technically defensible.