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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.
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Soil is graded as either well graded or poorly graded. [3] Soil gradation is determined by analyzing the results of a sieve analysis [4] [5] or a hydrometer analysis. [1] The process for grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System.
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public ...
Download as PDF; Printable version; ... AASHTO Soil Classification System; P. Polish Soil Classification; U. Unified Soil Classification System; USDA soil taxonomy; W.
Soil texture triangle showing the USDA classification system based on grain size Map of global soil regions from the USDA. For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses.
The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol.