In China, the standard can be accessed through:
): The relative decrease in soil volume upon inundation under a specific load. Accessing the PDF Standard
A small trimmings sample is used to determine the initial moisture content, specific gravity, and initial void ratio. astm d454621 pdf
After reaching the swell pressure, the specimen can be unloaded in increments to map its rebound/swell curve.
Once swelling stabilizes, vertical increments of load are applied to compress the specimen back down, or to establish a full consolidation curve. In China, the standard can be accessed through:
Measures 1D vertical expansion or collapse of clay soils upon wetting.
Indicates the exact amount of heave or hydrocompression that will occur when a specific depth of soil is fully inundated. 3. Test Method C (Loading After Wetting) Once swelling stabilizes, vertical increments of load are
While it can be tempting to look for "free" versions of ASTM standards on obscure websites, it is important to consider the risks. Unofficial PDFs may be:
For a complete geotechnical investigation, ASTM D4546-21 is often used alongside:
While the nuances vary by method, a standard ASTM D4546 test follows these fundamental steps:
Refined tolerances for consolidometer components, porous stones, and deformation gauges to minimize machine deflection errors.