1.
please help!
After drying, a soil is run through a set of sieves with the following percentages passing through
each sieve What is the uniformity coefficient? What is the USCS or AASHTO classification of
the soil?
Solution
from graph, D 60 =>10 and D 30 =0.4, C u = >25
C c =1.1 2
/(10*0.4) =<0.3
therefore, as per unified soil classification it can be treated as poorly graded sand
opening
(mm)
sieve
%finer
by mass
12.7 0.5in 52
4.75 #4 37
2 #10 32
0.841 #20 23
0.42 #40 11
0.25 #60 7
0.149 #100 4