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# Aashto Soil Classification System - Classification of Soil, Soil Mechanics Agricultural Engineering Notes | EduRev

## Agricultural Engineering : Aashto Soil Classification System - Classification of Soil, Soil Mechanics Agricultural Engineering Notes | EduRev

The document Aashto Soil Classification System - Classification of Soil, Soil Mechanics Agricultural Engineering Notes | EduRev is a part of the Agricultural Engineering Course Soil Mechanics Notes- Agricultural Engineering.
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Aashto Soil Classification System

According to the AASHTO soil classification system, the soils are classified based on the Group Index (GI) value which can be calculated as:

GI = 0.2 a + 0.005 ac + 0.01 bd

where

a is that part of the percent passing through the 75 m (0.075 mm) sieve greater than 35 and not exceeding 75, expressed as a positive whole number (range 1 to 40).

b is that part of the percent passing through the 75 m (0.075 mm) sieve greater than 15 and not exceeding 55, expressed as a positive whole number (range 1 to 40).

c is that part of liquid limit greater than 40 and not exceeding 60, expressed as a positive whole number (range 1 to 20).

d is that part of plasticity index greater than 10 and not exceeding 30, expressed as a positive whole number (range 1 to 20).

The group index should be rounded off to the nearest whole number. If the calculated group index value is negative, then it is taken as zero. A group index value equal to zero indicates a good subgrade material, whereas group index value equal to or greater than 20 indicates a very poor subgrade material.

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