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Calculate a soil's group index using the AASHTO method. 1 December 2015
GI(p200, LL, PL = NA, PI = NA)
AASHTO group index (rounded to the nearest integer)
= fines content, i.e. percent passing the #200 sieve (percent)
= liquid limit (percent)
= plastic limit (percent)
= plasticity index (percent)
Kyle Elmy and Jim Kaklamanos
GI(p200 = 48, LL = 45, PI = 21)
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