HIGHWAYS AND RAILROAD ENGINEERING

Question 1

Pavement in highway design means the total thickness of the road including surface base and the sub-base

Answer 1

STRUCTURAL DESIGN OF PAVEMENT

Question 2

2 Categories of Pavement

Answer 2

FLEXIBLE PAVEMENT
RIGID PACEMENT

Question 3

Is an asphalt pavement built with weaker and less stiff material. It does not spread load as well as concrete.

Answer 3

FLEXIBLE PAVEMENT

Question 4

Are made up of portland cement concrete outlast asphalt ( 10-15years ) before needing rehabilitation.
It distribute to load over a relatively wide area.

Answer 4

RIGID PAVEMENT

Question 5

Reasons asphalt pavement is selected:

Answer 5

1. Have lower initial construction cost allowing agencies to pay more with less funding.
2. Traffic noise is lesser
3. Due to its flexibility it performs well in areas of expansive soils.
4. Have a very smooth ride when it is newly constructed.
5. Maintenance can be performed quickly reducing service interruption.

Question 6

Reasons concrete pavement is selected:

Answer 6

1. Initially concrete pavement are more expensive however has a longer.
2. Less risk of water ka cumulation on the pavement, which reduces the chance of vehicles hydroplaning.
3. Concrete can be colored and/or stamp into a pattern that can be aesthetically appealing.
4. When maintenance is required it can be smaller in scope when having to replace select concrete areas.
5. During construction, concrete is less dependent upon the subgrade soils