22 A sample of inorganic soil was tested in the laboratory w

22 A sample of inorganic soil was tested in the laboratory with the following results: Sieve size Percent passing 81 No. 4 100 No. 10 93 No. 40 No. 200 60 Liquid limit = 42% Plastic limit = 16% Classify the soil sample by the AASHTO and the Unified Soil Classification (with the ASTM group name) systems. Show all the steps.

Solution

Soil classification= Gravelly sand(GS)....on the basis of size of sieve and %passing particles

And also check by the plastic index which is ...

Plastic index = liquid limit - plastic limit

And by the a line equation...

Plastic index= •73(liquid limit - 20%)

Where liquid limit and plastic limit both are in %