Lesson 2/Practice Exercise
2.
A sieve analysis provided the following data on a soil:
42 percent gravel
40 percent sand.
The primary letter for the USCS symbol is __________.
3.
A coarse-grained soil with less than 5 percent fines has a primary letter of _____ or _____ and a
secondary letter of _____ or _____.
4.
Classify this soil sample:
Gravel = 48 percent
Sand = 50 percent
Smooth grain size distribution curve
Cu = 5.3
Cc = 1.7.
The classification of the soil is __________.
Use the plasticity chart on the previous page and Figure 17 to help you classify the following soil
samples:
5.
Gravel = 51 percent
LL = 21 percent
Sand = 34 percent
PL = 15 percent
USCS Symbol
6.
Gravel = 23 percent
LL = 63 percent
Sand = 37 percent
PL = 15 percent
USCS Symbol
7.
Gravel = 26 percent
Cu = 3.8
Sand = 67 percent
Cc = 2.4
LL = 62 percent
Most of the material falls between the #10 and #40 sieve.
PI = 18 percent
USCS Symbol
8.
Black in color with a musty, leafy odor.
LL = 37 percent
PL = 4 percent
USCS Symbol
9.
When performing a visual examination in the field, you will check for color, grain size,
__________, grain shapes, and the undisturbed soil properties.
a.
specific gravity
b.
liquid limit
c.
grain size distribution
d.
cohesiveness
10.
__________ soils can be identified by a characteristic odor when they are moist.
a.
Fine-grained
b.
Coarse-grained
c.
Organic
d.
Silty
53
Previous Page
