How do you design a road pavement?
Pavement Design in Road Construction – Design Parameters
- Introduction.
- General:
- Traffic:
- As per the IRC:37 design traffic should be 0.1 msa to 2 msa (million standard axles). Weight of commercial vehicle (laden) is considered as 3 tonnes or more.
- Computation of design traffic:
- Subgrade:
- CBR:
- Sub-base course:
How do you calculate structural number of pavement?
The Structural Number is a value that applies to the overall pavement structure, but to complete the design we still need to get from this value to the individual layer thicknesses. This is handled using an equation of the type shown below: SN = a1D1 + a2D2M2 + a3D3M3 + …
How thick should asphalt be?
Residential driveways typically use 2 to 3 inches of asphalt with 3 being suitable for occasional large trucks or heavy equipment. Underneath the asphalt you should have 6 to 8 inches of granular base aggregate. Underneath this you have soil.
How thick is asphalt on a highway?
For standard commercial jobs, the dense-graded aggregate layer is typically about 8” thick. On top of the base, we typically recommend applying two 1.5” layers of asphalt. The first binder layer of 1.5” would be a thicker stone.
What are the design parameters for pavement design?
When designing pavements (both mix design and structural design), there are three fundamental external design parameters to consider: the characteristics of the subgrade upon which the pavement is placed, the applied loads and the environment.
What is pavement design?
A highway pavement is a structure consisting of superimposed layers of processed materials above the natural soil sub-grade, whose primary function is to distribute the applied vehicle loads to the sub-grade. Improper design of pavements leads to early failure of pavements affecting the riding quality.
What is the minimum thickness of pavement?
➢The thickness of sub-base should not be less than 150 mm for design traffic less than 10 msa and 200 mm for design traffic of 10 msa and above. ➢The recommended minimum thickness of granular base is 225 mm for traffic upto 2 msa and 250 mm for traffic exceeding 2 msa.
