Road Crush Question 1. In pavement design, each layer coefficient a. Is determin

Question

Road Crush

Question 1. In pavement design, each layer coefficient
a. Is determined by the material of the layer
b. Can be affected by the thickness of the layer
c. Both a and b
d. None of the above

Question 2. Which of the following is NOT true?
a. The material for subgrade cannot be changed
b. Hot mixed asphalt (HMA) can be used for subbase
c. HMA can be used for base
d. Wearing surface does not need to be HMA

Question 3. Which of the following is true?
a. Thicker layers will always lead to stronger pavement
b. An engineer should tend to choose the strongest material when designing the pavement
c. The pavement design parameters are the thickness and material of each layers
d. All of above are true

Question 4. Given the same traffic volume, trucks have
a. Much lower ESALs than passenger cars
b. Similar ESALs to passenger cars
c. Much higher ESALs than passenger cars
d. None of the above

Question 5. For a given ESALs value, the pavement
a. Should be designed to be stronger if the traffic mix contains more trucks
b. Should be designed to be stronger if the traffic mix contains more cars
c. Should be designed equally strong
d. None of above is true

Explanation / Answer

1. (a) determined by material of the layer because layer coefficient is dependent upon resilient modulus of each layer.

2. (a) Material of subgrade cannot be changed. Often soil from borrow pits are added when CBR of natural subgrade is too low.

3. (a) Thicker layers will always lead to stronger pavements. Increasing thickness of pavement leads to increase

4. (c) Each truck has much higher ESAL than cars.

5. (c) should be designed equally strong because we are already converting it into equivalent number of standard axle loads.

1. (a) determined by material of the layer because layer coefficient is dependent upon resilient modulus of each layer.

2. (a) Material of subgrade cannot be changed. Often soil from borrow pits are added when CBR of natural subgrade is too low.

3. (a) Thicker layers will always lead to stronger pavements. Increasing thickness of pavement leads to increase

4. (c) Each truck has much higher ESAL than cars.

5. (c) should be designed equally strong because we are already converting it into equivalent number of standard axle loads.

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