Grain size distributions curves are given for 9 soils in Figures 1, 2 and 3. The LiquidLimit and Plastic Limit for the fine-grained portion of these soils are given in Table 1.a) Classify the soils according to ASTM/USCS (i.e., give both the Group Symboland Group Name).b) It is proposed that Soil 3 (Figure 2) be used for a highway subgrade. What is theAASHTO soil classification for this soil (see classification table on the last page ofthis assignment)? What is this soil's general rating as a subgrade? U.S. Standard sieve size를 in.No. 4 No. 10 No. 403 in.100No. 200908070605040302010o Lu100101.00.10.010.001Grain size (mm)GRAVELSANDCOBBLESSILT OR CLAYCearseFineCoarse MediumFineFigure 1U.S. Standard sieve size3 in.100in.No. 4 No. 10 No. 40No. 200908070605040302010o Lilu1001.00.01100.10.001Grain size (mm)GRAVELSANDCOBBLESSILT OR CLAYCoarseFineCoarseMediumFineFigure 2Percent finer by weight (or mass)Percent finer by weight (or mass) U.S. Standard sieve size3 in.100글 in.No. 4 No. 10 No. 40 No. 200908070605040302010100101.00.10.010.001Grain size (mm)GRAVELSANDCOBBLESSILT OR CLAYCoarseFineCoarseMediumFineFigure 3Table 1: Atterberg Limits for Soil MaterialsFigure #Soil #LLPL11N/AN/A12N/AN/A13N/AN/A2134322240283643531463033027337532Percent finer by weight (or mass)2.

The soil classification by USCS method is based on the following criteria, Grain size distribution…

Answered: Grain size distributions curves are…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

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Grain size distributions curves are given for 9 soils in Figures 1, 2 and 3. The Liquid
Limit and Plastic Limit for the fine-grained portion of these soils are given in Table 1.
a) Classify the soils according to ASTM/USCS (i.e., give both the Group Symbol
and Group Name).
b) It is proposed that Soil 3 (Figure 2) be used for a highway subgrade. What is the
AASHTO soil classification for this soil (see classification table on the last page of
this assignment)? What is this soil's general rating as a subgrade?

U.S. Standard sieve size
를 in.
No. 4 No. 10 No. 40
3 in.
100
No. 200
90
80
70
60
50
40
30
20
10
o Lu
100
10
1.0
0.1
0.01
0.001
Grain size (mm)
GRAVEL
SAND
COBBLES
SILT OR CLAY
Cearse
Fine
Coarse Medium
Fine
Figure 1
U.S. Standard sieve size
3 in.
100
in.
No. 4 No. 10 No. 40
No. 200
90
80
70
60
50
40
30
20
10
o Lilu
100
1.0
0.01
10
0.1
0.001
Grain size (mm)
GRAVEL
SAND
COBBLES
SILT OR CLAY
Coarse
Fine
Coarse
Medium
Fine
Figure 2
Percent finer by weight (or mass)
Percent finer by weight (or mass)

U.S. Standard sieve size
3 in.
100
글 in.
No. 4 No. 10 No. 40 No. 200
90
80
70
60
50
40
30
20
10
100
10
1.0
0.1
0.01
0.001
Grain size (mm)
GRAVEL
SAND
COBBLES
SILT OR CLAY
Coarse
Fine
Coarse
Medium
Fine
Figure 3
Table 1: Atterberg Limits for Soil Materials
Figure #
Soil #
LL
PL
1
1
N/A
N/A
1
2
N/A
N/A
1
3
N/A
N/A
2
1
34
32
2
2
40
28
3
64
35
3
1
46
30
3
30
27
3
3
75
32
Percent finer by weight (or mass)
2.

Expert Solution

Step 1: Soil classification:

The soil classification by USCS method is based on the following criteria,
- Grain size distribution
- Atterburg's limit
- Compressibility characteristics
The soil is classified as highly organic soil, if the given soil is dark in color and produces a foul smell or unpleasant smell.
The soil is classified into fine-grain soil or coarse-grain soil based on the soil passing through the 0.075mm sieve.
Less than 50% of the soil is passing through the 0.075mm sieve.
So, the soil is classified as coarse grain soil else it is classified as fine-grain soil.
Further, the coarse grain soil is classified into gravel and sand, based on the soil passing through the 4.75mm sieve.
More than 50% of the soil is passing through the 4.75mm sieve.
So, the soil is sandy soil else it is classified as gravel soil.
Further, the coarse grain soils are classified as poorly graded soil or well-graded soil based on the co-efficient of curvature and co-efficient of curvature, if the fine content is less than 5%.
If the fine content is more than 12%, the gravel and sandy soil is classified with the clay and silt as,
- Sandy clay
- Sandy silt
- Clayey gravel
- Silty gravel
The fine grain soil is classified into clay, silt, or organic soil based on the plasticity index and liquid limit of the soil.
Further, the fine-grain soil is classified as low compressible, intermediate compressible, and highly compressible soil based on the liquid limit of the soil.

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