Unified Soil Classification System

The Unified Soil Classification System, Technical Memorandum No. 3-357, Volume 1, March 1953, Waterways Experiment Station, Vicksburg, MD. 

ASTM. D2487. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System). American Society for Testing and Materials, Philadelphia, PA, p. 12. ASTM. D4767. Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soil. American Society for Testing and Materials, Philadelphia, PA, p. 14. 

ASTM. 2011. Standard Practice for Classification of Soils for Engineering Purposes-D2487. Unified Soil Classification System. American Society for Testing and Materials, Philadelphia, PA. 

Wagner, A.A. 1957. The use of the unified soil classification system by the bureau of reclamation. Proceedings of the 4th International Conference on Soil Mechanics and Foundation Engineering (London), 1 125. 

A necessity was also recognised, more than 60 years ago, for runway pavements where the construction had to be more meticulous because of heavier loads applied to the pavement. As a consequence, in the 1940s, Casagrande developed another classification system for airfields (Taylor 1948). It was then named as Unified Soil Classification System... 

ASTM D 2487. 2011. Classification of soils for engineering purposes (Unified Soil Classification System). West Conshohocken, PA ASTM International. 

Classify soil phase by the Unified Soil Classification system... 

Fine-grained soil as defined by the Unified Soil Classification System (uses) is used for clay liner construction. According to USCS a soil is classified as fine grained if a minumun of 50% of a given sample by weight passes through the 200 sieve. In addition, the clay used for liners must have ... 

As already mentioned, less than 5% of bachelors level civil engineering students actually go forward to specialize in geotechnics. In a number of major colleges, the outdated curriculum in soil mechanics is driving away the best students because the faculty harp on the mundane issues of old and archaic subject matter within our discipline i.e., Atterbeig limits. Unified Soil Classification System, AASHTO system, soil compaction, time-rate-of consolidation, flow... 

Classify.. a soil according to the Unified Soil Classification System (USCS), which is summarized under ASTM D2487, by providing a group symbol and group name. (3)... 

A qualified technician or geologist should classify the soil material. The Unified Soil Classification System is normally used in classifying soils for HDD projects. This soils classification system is described in detail in ASTM Standard D 2487. The ASTM Standard bases the soil classifications on laboratory tests performed on soil samples passing the 3 inch sieve. Some definitions from ASTM D 2487 that are relevant to HDD operations are ... 

In the Unified Soil Classification system, a sand is defined as well graded if it meets the following criteria ... 

Step 1. Identify the properties of the subgrade, including the CBR, the location of the ground-water table, the AASHTO and/or Unified Soil Classification System (USCS) classification,... 

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