Geology Reference
In-Depth Information
Figure 11-3
Plasticity Chart [2]
Example 11-2
Given:
A sample of soil was tested in the laboratory with the following
results:
1. Liquid limit
30.0%
2. Plastic limit
12.0%
3. Sieve analysis data:
U.S. Sieve Size
Percentage Passing
3
⁄
8
in.
100
No. 4
76.5
No. 10
60.0
No. 40
39.7
No. 200
15.2
Required:
Classify the soil by the Unified Soil Classification System.
Solution:
Because the percentage retained on the No. 200 sieve (100
-
15.2,
or 84.8%) is more than 50%, go to the block labeled “Coarse-Grained
Soils” in Table 11-3. The sample consists of 100
-
15.2,
or 84.8%,
coarse-grain sizes, and 100
-
76.5,
or 23.5%, was retained on the
No. 4 sieve. Thus the percentage of coarse fraction retained on the
No. 4 sieve is (23.5/84.8) (100), or 27.7%, and the percentage of
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