Astm D454621 Pdf Jun 2026

Soils containing clay minerals like montmorillonite expand when they absorb water. This expansion can exert massive upward pressure, cracking foundations, slabs, and pavements.

The resulting vertical deformation (expansion or compression) is measured at equilibrium. Method B: Percent Swell vs. Vertical Stress

| | Details | |------------|-------------| | Full Title | Standard Test Methods for One‑Dimensional Swell or Collapse of Soils | | ASTM Designation | D4546-21 | | Publication Date | April 1, 2021 | | Page Count | 10 pages | | ICS Code | 93.020 (Earth works, excavations, foundation construction, underground works) | | Main Test Methods | A (reconstituted specimens), B (intact specimens), C (load‑induced strains after wetting) | | Key Parameters | Heave, settlement, swell pressure, free swell | | Typical Equipment | Dead‑weight or pneumatic consolidometer, oedometer cell, dial gauges | | Purchase Price (PDF) | Approximately $27–$54 USD |

A dial gauge or electronic displacement transducer (LVDT) accurate to at least 0.0025 mm (0.0001 in.). astm d454621 pdf

Executing an ASTM D4546-21 test requires a precise oedometer (consolidation) setup.

Placed at the top and bottom of the specimen to allow water to enter the soil uniformly while preventing material loss.

ASTM D4546-21 establishes laboratory methods to quantify the one-dimensional swell or collapse of unsaturated soils upon wetting, providing critical data for geotechnical engineering. The standard outlines three test methods (A, B, and C) to determine swelling pressure, free swell, and hydrocompression potential in soils. To access the full standard, purchase the document from ASTM International ASTM International Method B: Percent Swell vs

): The vertical stress required to prevent swelling, or the stress required to return a swollen specimen back to its pre-wetted height. Void Ratio (

Apply a seating load to ensure proper contact between the components.

If the swell pressure exceeds the allowable bearing capacity or structural weight of a building, engineers must avoid shallow foundations and design deep foundations (such as drilled shafts or piers) that bypass the active zone of moisture fluctuation. Placed at the top and bottom of the

The results generated from ASTM D4546-21 testing impact several phases of civil infrastructure design:

The ASTM D4546-21 standard is available in PDF format from various sources, including: