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Design of Flexible Pavements


Quiz Questions

1. Major defect types that can be observed on flexible pavements are:
Cracking
Deformations
Disintegration and wear
All of the above
2. The results of the AASHO road test are still used today.
True
False
3. The AASHTO design method had the drawback of being:
Too easy
Long
Empirical
None of the above
4. The cracks in the picture below is due to:
Design of Flexible Pavements 1
High temperature
Low temperature
Rain
None of the above
5. Raveling, bleeding and pothole formation can be rated as signs of:
Disintegration
Wear
Both
6. The Timber truck in the picture below is completely stuck on an earth road due to too ________ contact pressures and a too low shear resistance of the pavement material.
Design of Flexible Pavements 2
Low
High
7. A system with a stiffer layer on top of a softer half space is called a ___________ layer system.
One
Two
Three
Four
8. If the horizontal tensile stress at the bottom of the top layer is too high, it will be the cause for cracking of the __________ layer.
Top
Bottom
9. ________________ shear stresses act in the longitudinal and transverse direction
Vertical
Horizontal
10. Knowledge on axle and wheel loads is important but even more so is knowledge on the contact pressures.
True
False
11. Temperature has a significant effect on the:
stiffness
fatigue
permanent deformation resistance of asphalt mixtures
All of the above
12. TGP takes a ___________ value when the top part of the total asphalt thickness is softer than the bottom part.
Negative
Positive
13. Moisture has a large effect on the ____________ and bearing capacity of soils and unbound materials
Stength
Stiffness
14. Repeated load tests are needed to obtain the stiffness characteristics of asphalt mixtures in relation to the loading time and _______.
Length
Temperature
15. The procedure proposed by the Belgian Road Research Centre is preferred since it is based on a dataset.
More detailed
Smaller
Larger
More accurate
16. ______________ of the asphalt mixture has to do with the fact that asphalt mixtures have the capacity to "repair" themselves.
Peeling
Straining
Healing
None of the above
17. Because of lateral wander, the ______________ stresses and strains don’t always occur in the same location.
Minimum
Maximum
18. Which one of the following does not affect the vertical stress at which shear failure occurs in a granular material?
the amount of confinement
the cohesion
angle of internal friction of the material considered.
the strain
19. The picture below displays excessive pavement deformation due to deformation of the:
bound base
unbound base
20. Van Niekerk’s work has also been used to develop relations for the allowable ____________ strain at the top of the unbound base or subbase.
Vertical
Horizontal
21. Depending on the load transfer across these cracks, significant traffic induced tensile strains might develop to these cracks resulting in longitudinal cracking.
Parallel
Perpendicular
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