Practice Dynamic Cone Penetration Test (dcpt) (4.3.1.3) - Evaluation of Soil Strength for Pavements

Practice: Dynamic Cone Penetration Test (DCPT)

Lesson 4.3.1.3Evaluation of Soil Strength for Pavements

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10 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the main purpose of the DCPT?
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Think about what we want to know before designing a pavement.
Question 2.
What equipment is used in the DCPT?
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What do we drop to drive the cone into the soil?
3Question 3.
What does the DCPT measure?
- A) Soil Density
- B) Soil Strength
- C) Soil Moisture
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What do we need to know about the soil before building on it?
4Question 4.
The results of the DCPT can be correlated with which values?
- A) California Bearing Ratio (CBR)
- B) Soil Compaction
- C) Shear Strength
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Remember the importance of CBR in pavement design.
Question 5.
You perform a DCPT and record the following penetration depths: 10mm, 12mm, 15mm, 14mm. Calculate the average penetration and discuss what this average might imply about the soil's strength.
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Think about how depth relates to strength.
Question 6.
In a project, the DCPT indicated weak soil, but a laboratory test afterward showed adequate strength. Discuss possible reasons for this discrepancy and how to handle such situations.
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Consider the nature of soil samples and field conditions.

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