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Lesson 1: Permanent Deformation
2. Stresses and strains in road structures
Lesson 2 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 2 Test

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Question 1 of 6

1. Question
Choose the right alternative /alternatives
- Highest compressive strain is located under a wheel load in bound layers
- Highest vertical stress is stress is located under a wheel load
- Uneven road increases stress levels in pavement
Correct

Incorrect
Question 2 of 6

2. Question
Choose the right alternative /alternatives
- In road structure moduli value always decrease from top to bottom
- According to Odemark design principle lower moduli material can be compensated by building a thicker structure
- Odemark design method is based on linear elastic theory
Correct

Incorrect
Question 3 of 6

3. Question
The most critical positions for the development of permanent deformation are:
- High vertical compressive stress and strain on the top of the subgrade
- Horizontal tensile strain in unbound layers
- High horizontal tensile strain at the bottom of the bound layers
Correct

Incorrect
Question 4 of 6

4. Question
You have a following road structure: subgrade moduli 20 MPa, 40 cm of unbound base with moduli 100 Mpa and 10 cm of bituminous layer with moduli 1500 Mpa. Which statements are true?
- You have a following road structure: subgrade moduli 20 MPa, 40 cm of unbound base with moduli 100 Mpa and 10 cm of bituminous layer with moduli 1500 Mpa. Which statements are true?
- Lower tyre pressures reduces substantially vertical strain in subgrade
- Increase moduli in unbound layer reduces substantially also horizontal strain in pavement bottom
Correct

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Question 5 of 6

5. Question
An example of a road structure and loading is shown in the figure below. Choose the most suitable description. (Click image to view full size)
- The vertical compressive strain at the top part of the unbound layers is very high and there is a very high risk of immediate failure / Mode 1 rutting.
- The vertical compressive strain on the top of the subgrade is high and there is a high risk of Mode 2 rutting.
- The vertical compressive strain at the top part of the unbound layers is low and there is a very low risk of Mode 1 rutting.
- The vertical compressive strain on the top of the subgrade is low and there is a very low risk of Mode 2 rutting.
Correct

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Question 6 of 6

6. Question
An example of a road structure and loading is shown in the figure below. Choose the most suitable description.(Click image to view full size)
- The vertical compressive strain at the top part of the unbound layers is high and there is a high risk of Mode 1 rutting.
- The vertical compressive strain on the top of the subgrade is high and there is high a risk of Mode 2 rutting.
- The horizontal tensile strain at the bottom of the bound layers is moderate and there is a medium risk of pavement fatigue.
- The vertical compressive strain on the top of the subgrade is low and there is a very low risk of Mode 2 rutting.
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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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