![]() ![]() If the calculated group index value is negative, then it is taken as zero. The group index should be rounded off to the nearest whole number. Note that these definitions are AASHTO definitions and are slightly different than those of the Unified Soil Classification system (ASTM).According to the AASHTO soil classification system, the soils are classified based on the Group Index (GI) value which can be calculated as:Ī 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).ī 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).Ĭ is that part of liquid limit greater than 40 and not exceeding 60, expressed as a positive whole number (range 1 to 20).ĭ is that part of plasticity index greater than 10 and not exceeding 30, expressed as a positive whole number (range 1 to 20). Fine aggregate shall be free from vegetable matter and lumps or balls of clay. 40) sieve shall have a LL ≤ 25 and a PI ≤ 6. 200) sieve shall not be greater than two-thirds of the fraction passing the 0.425 mm (No. 10) sieve and consisting of natural or crushed sand, and fine material particles passing the 0.075 mm (No.
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