ASTM D422
Full Name
ASTM D422 – Standard Test Method for Particle-Size Analysis of Soils
Scope
ASTM D422 is a comprehensive standard that provides a systematic approach to determining the particle-size distribution of soils. This analysis is essential for understanding the physical properties, behavior, and suitability of soils in various engineering applications.
Key components of ASTM D422:
- Sample preparation: the test begins by preparing a representative soil sample. This involves drying the sample to a specific moisture content and ensuring it is free from any contaminants.
- Sieve analysis: the prepared sample is passed through a series of sieves with progressively smaller openings. The amount of soil retained on each sieve is then measured to determine the percentage of particles within specific size ranges.
- Hydrometer analysis: for finer particles, a sedimentation method using a hydrometer is employed. The hydrometer measures the density of the suspension, which is related to the concentration of particles in the water.
- Data analysis: the results from both sieve and hydrometer analysis are combined to create a particle-size distribution curve. This curve provides a visual representation of the percentage of particles within different size ranges.
Applications of ASTM D422:
- Geotechnical engineering:
- Foundation design: determining the bearing capacity of soils.
- Slope stability analysis: assessing the risk of landslides.
- Earthwork construction: selecting appropriate materials for fill and compaction.
- Soil mechanics:
- Permeability: understanding the rate at which water flows through the soil.
- Shear strength: evaluating the soil’s resistance to deformation under load.
- Construction materials:
- Concrete: assessing the suitability of aggregates for concrete production.
- Asphalt: evaluating the gradation of aggregate for asphalt mixtures.
ASTM D422 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM D422 standard.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
particle-size distribution; soil; gradation; sieve analysis; hydrometer analysis; geotechnical engineering; soil mechanics; construction materials; foundation design; slope stability; earthwork construction; permeability; shear strength; concrete; asphalt; aggregates; sedimentation; suspension; density; representative sample; moisture content; contaminants; standardized procedure; quality control