AASHTO Soil Classification System
- AASHTO Soil Classification System
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. The classification system was first developed by in 1929, [cite journal |last=Hogentogler |first=C.A. |coauthors=Terzaghi, K. |title=Interrelationship of load, road and subgrade |journal=Public Roads |month=May |year=1929 |pages=pp.37-64] but has been revised several times since.
Note (1): Plasticity index of A-7-5 subgroup is equal to or less than the LL - 30. Plasticity index of A-7-6 subgroup is greater than LL - 30
References
Non-free standard specifications
*cite book |title=AASHTO M 145 Standard Specifications for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes |year=1991 |author=American Association of State Highway and Transportation Officials |url=http://auto.ihs.com/document/abstract/QOXFIBAAAAAAAAAA
*cite book |title=ASTM D3282-93(2004)e1 Standard Practice for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes |volume=04.08 |author=Subcommittee D18.07 |year=2004 |url=http://www.astm.org/Standards/D3282.htm
See also
* Unified Soil Classification System
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