Astm D454621 - Pdf
The strain induced by wetting is calculated using the formula:
The easiest way to obtain the official PDF is through authorized distributors like ASTM International, Accuris, or Normadoc. Prices typically range from $54–$86, with subscription-based access available through ASTM Compass.
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." astm d454621 pdf
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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| Application | Description | |-------------|-------------| | | Predicts ground surface rise from wetting-induced expansion of unsaturated soils (e.g., damage to foundations, slabs, and pavements) | | Settlement estimation | Assesses potential collapse settlement when previously unsaturated soils become fully saturated (important for fills, embankments, and shallow foundations on collapsible deposits) | | Foundation design | Provides essential soil parameters for designing structures on problematic soil profiles | | Quality control | Confirms that compacted fills meet swell/collapse criteria in sensitive projects |
Method B measures the one-dimensional wetting-induced swell or collapse of obtained from natural deposits or existing compacted fills. This is commonly called a single-point wetting-after-loading test, typically using a single intact specimen for each depth of interest. This is critical for evaluating soils that are
This method is explicitly designed to determine the true swell pressure of the soil.
The "-21" suffix denotes that the standard was updated or reapproved in the year 2021. ASTM standards undergo periodic reviews to refine methodologies, improve precision, and incorporate modern laboratory technologies.
Geotechnical engineering relies on accurate laboratory testing to predict how soil behaves under structural loads and environmental changes. One of the most critical challenges in foundation design is managing expansive and collapsible soils.