What Is the AASHTO Classification System | AASHTO Classification System Procedures

Introduction of AASHTO

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AASHTO Classification System Procedures

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Rules for Determining the GI

If Eq. (1) yields a negative value for GI, it is taken as 0. The group index calculated from Eq. (1) is rounded off to the nearest whole number (for example, GI = 3.4 is rounded off to 3; GI = 3.5 is rounded off to 4). There is no upper limit for the group index. The group index of soils belonging to groups A-1-a, A-1-b, A-2-4, A-2-5, and A-3 is always 0 . When calculating the group index for soils that belong to groups A-2-6 and A-2-7 , use the partial group index for PI , or Read more

Soil Conslotion Download for Click Here

AASHTO Soil Classification

F200 = 86 % > 50% , therefore the soil is fine grained soil (clay or silt) From plasticity chart with LL=55% and PI=28%, the soil is located above the A-line, therefore the group symbol is CH (clay with high plasticity) (inorganic clay) or (fat clay). Read more

Classification of Soil in Civil Engineering

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What Is the AASHTO Classification System | AASHTO Classification System Procedures

Introduction of AASHTO