The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. The AASHTO Soil Classification System was developed by the American Association of State Highway and Transportation Officials, and is used as a guide for the classification of soils and soil-aggregate mixtures for highway construction purposes. DOI: 10.1520/D3282-15. ASTM D3282.

A-7-5 A-7-6 Sieve Analysis, % A-1 3 2 4 5 6 7. A-6: A-7 A-1-a. ASTM D3282-15: Standard Practice for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes gives laboratory tests and uses a left to right process of elimination through a table from the AASHTO system to determine the subgrade of viable airfields or roads.

Silt-Clay Materials >35% passing the 0.075 mm sieve Group Classification; A-1 A-3. The classification system was first developed by Hogentogler and Terzaghi in 1929, but has been revised several times since. ASTM D3282-15, Standard Practice for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes, ASTM International, West Conshohocken, PA, 2015, www.astm.org.
A-1-b: A-2-4. Related Standards: ASTM D420, ASTM D421, ASTM D422, ASTM D653, … Back to Top
Citation Format. A-2 A-4: A-5. A-2-5 A-2-6: A-2-7.