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Lesson 1: Permanent Deformation
4. Survey and monitoring techniques
Lesson 4 Test

Lesson 1: Permanent Deformation

eLearning lessons
1. What is permanent deformation and why we do not like it
2. Stresses and strains in road structures
3. Permanent deformation rutting classification
4. Survey and monitoring techniques
5. Classifications, analysis and diagnostics
6. Managing permanent deformation
7. Design against permanent deformation

Lesson 4 Test

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Question 1 of 10

1. Question
Is this material suitable as base course material?
- Yes, it is a good quality for a base course material.
- No, it is inappropriate as base course material.
- It is questionable as base course material.
Correct

Incorrect
Question 2 of 10

2. Question
What are the factors in the grading curve that are increasing the risk of permanent deformation?
- The grading curve is ok and the material should perform well
- Accordin to grading curve the material contains too much fines and a Tube Suction test has to be done
- The grading curve is too open graded. Sand has to be added to this material
- The grading curve has a "sand bag". Extra ballast has to be added to this material
Correct

Incorrect
Question 3 of 10

3. Question
Which of the following statements are true?
- A comprehensive drainage evaluation should preferably be carried out every 6-8 years.
- A high BCI value indicates Mode 1 rutting problems.
- The diameters of the nets in the alligator cracking in Mode 2 rutting are normally smaller than those of Mode 1 and cracking appears outside the wheel path.
- The IRI value tells you about vertical unevenness on the road.
- You can find out the chlorides content of material with a Protector test.
- Auger drilling excavacation pits and GPR can provide information on structure thickness.
Correct

Incorrect
Question 4 of 10

4. Question
The GPR technique shown below can be used in low volume road surveys for:
- Making structural evaluations of low volume roads.
- Estimating the stiffness of the road structures.
- Estimating how sensitive the base course is for permanent deformation
- Measuring frost depths in the winter.
- Measuring rut depths.
- Measuring the moisture content of the base course.
Correct

Incorrect
Question 5 of 10

5. Question
Which three survey methods are recommended to be carried out as a minimum when resources are limited in a rehabilitation project?
- GPR
- Digital video with GPS
- FWD at 50m intervals
- Drainage evaluation including checking the culverts
- DCP
- Sampling
- Rutting and roughness measurements
- Excavation pits
- A distress and damage survey in the field or based on video
Correct

Incorrect
Question 6 of 10

6. Question
Good indications for permanent deformation problems are:
- A rutting increase of 0,6mm/year
- FWD SCI values higher than 300µm
- Poor drainage in the upper ditch
- BCI values varying between 20-30µm
- The road has transverse cracking problems
- The base course dielectric value measured with GPR is between 12-16
Correct

Incorrect
Question 7 of 10

7. Question
Which of the following statements are true:
- High FWD SCI values indicate high strain in the pavement
- The DCP method is good formeasuring frost depth during the spring thaw period
- High FWD BCI values indicate the presence of bedrock
- Dielectric value is a function of volumetric water content
- When a soil freezes the dialectric value drops to level of 1
- When a soil freezes the electrical conductivity drops to level less than 1
Correct

Incorrect
Question 8 of 10

8. Question
Optimal seasonal monitoring systems require?
- Monitoring of heavy loads
- Monitoring of moisture content in the road structures
- Monitoring temperature in the road structures
- Monitoring deflections
- Monitoring weather and rainfall
- Monitoring frost depth
Correct

Incorrect
Question 9 of 10

9. Question
Indicators for Mode 2 rutting are:
- "Onion structures" seen the GPR data
- Subgrade moduli values less than 20MPa
- A subgrade of a sandy material
- Widening of a gravel road
- Road settlement
Correct

Incorrect
Question 10 of 10

10. Question
What characterizes a problem base course material and Mode 1 problems
- Clay content of 2%
- Fines content of 6%
- Specific surface area of lines of 6000m²/kg
- Water adsorption index of 1.8%
- Tube Suction test value of 18
Correct

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eLearning lessons

Lesson 1: Permanent Deformation
Lesson 2: Roads on Peat
Lesson 3: Drainage of Low Volume Roads
Lesson 4: Environmental Considerations for Low Volume Roads
Lesson 5: Gravel and Forest Road

English (Updated)
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