Plasticity Index Test ASTM D4318
21 Questions
| Attempts: 156
The plasticity index is a measure of the plasticity – i. E. The adaptability to changes in environment or difference between habitats - of a specific soil. What can you tell us about this particular index and how it’s used?
Questions and Answers
- 1.The scale used for the plasticity Index test shall be readable to _________g.
- A.
0.1
- B.
1
- C.
0.01
- D.
0.5
- 2.When using the dry preparation method the sample is dried back at no more than ________c?
- A.
120c
- B.
60c
- C.
100c
- D.
40c
- 3.After drying the sample is ground up with a rubber pestle and seperated over __________ sieve?
- A.
# 40
- B.
# 10
- C.
# 4
- D.
# 16
- 4.After the soil has been pulverized and seperated over the approprite sieve it get moisture condition to ___to______ blows of the liquid limit device.
- A.
20, 30
- B.
25, 35
- C.
30, 40
- 5.After the sample is mosture conditioned it is covered and allowed to sit a minumum of ______ hours.
- A.
12
- B.
10
- C.
16
- D.
24
- 6.When performing the liquid limit test spread the soil in the cup so at maximum depth is not more than _______mm.
- A.
10 mm
- B.
5 mm
- C.
20 mm
- 7.7) The liquid limit cup drop rate is _______.
- A.
1 drop/sec
- B.
2 drops/sec
- C.
4 drops/sec
- 8.When speading the soil in the cup take care to avoid air bubbles in the soil? True or False?
- A.
True
- B.
False
- 9.The unused portion of the soil shall be covered with a wet towel during the liquid limit test.
- A.
True
- B.
False
- 10.Adjust the moisture content so the groove closes for the first point at _____ blows the second
- A.
25 to 35, 20 to 30, 15 to 25
- B.
30 to 40, 20 to 30, 10 to 20
- C.
35 to 40, 20 to 30, 10 to 20
- 11.Once you have adjusted the moisture content to close at the approximate # of blows a sample semi-logrithmic graph is taken from the cup and the water content is performed on it in accordance with ASTM D2216.
- A.
True
- B.
False
- 12.The moisture content and number of blows for each of the 3 points are plotted on and where the line crosses_____ blows at the moisture content that is the liquid limit.
- A.
20
- B.
25
- C.
35
- D.
30
- 13.The liquid limit is reported to the nearest ______.
- A.
Whole number
- B.
0.01
- C.
0.1
- 14.When rolling out the plastic limit thread it must be on a ground plate at least 12 inches square and 3/8 inches thick.
- A.
True
- B.
False
- 15.A sample of _____ grams or more is removed from the liquid limit material to run the plastic limits test.
- A.
15
- B.
10
- C.
20
- D.
40
- 16.For each plastic limit test roll a ____ to ____ gram ball is removed from the sample and formed into an ellipsoidal ball.
- A.
2.0, 3.0
- B.
2.5, 3.0
- C.
1.5, 2.0
- 17.Then the elipsoidal ball is rolled between your fingers or palm on the ground glass plate until the thread crumbles at _____ inch diameter.
- A.
1/4
- B.
1/2
- C.
1/8
- D.
1
- 18.The pieces from the thread are molded into a ball and rolled again or until they will no longer roll into a thread. True or False?
- A.
True
- B.
False
- 19.The minimum weight of plastic limit test shall be _____ grams.
- A.
10
- B.
20
- C.
8
- D.
6
- 20.The plastic limit is calcualted by the results of 2 test specimens. True or False?
- A.
True
- B.
False
- 21.The plasticity Index is calcualted by _________.
- A.
Liquid Limit + Plastic Limit
- B.
Liquid Limit - Plastic Limit
- C.
Plastic Limit - Liquid Limit
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