The consistency limit is for fine grained soil which is having size less than 75 microns but we are using 425 microns passing soil for consistency limit determination. From the above taking soil particles less than 75 microns will be the apt one for determining consistency limit. Then why we are taking 425 microns passing soil.
one reason can be the history of the test, you can go through the past when atterberg limits were coined or when this distinction between fgs and cgs was made.
other and the most important part of your question is why?
since we know the FGS's have a tendency to swell and shrink, the reason to get most accurate result is to use a more coarser sample.
hope this clarifies why we use 425 microns sample set...if we dont then the results will vary invariably
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