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Design-of-Highway-Pavements
If total repetitions of commercial vehicles are known, n design traffic is taken as __ of it.
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This Chapter Design-of-Highway-Pavements consists of the following topics
Design the thickness of a rigid pavement slab for a two-way, two-lane National highway in the state of West Bengal. The total two-way traffic is 2500 CVPD at the end of the construction period. The flexural strength of concrete is 45 kg/cm2, modulus of subgrade reaction is 8 kg/cm3, tyre pressure is 8 kg/cm2, the rate of traffic increase is taken as 7.5 %, the spacing of contraction joints is 4.5 m and the width of the slab is 3.5 m. Assume any other data required. The axle load spectrum obtained from a survey is given below:
| Single Axle Load | Tandem Axle Load | ||
|---|---|---|---|
| Axle load class (tons) | Percentage of axle load | Axle load class (tons) | Percentage of axle load |
| 19-21 | 0.6 | 34-38 | 0.3 |
| 17-19 | 1.5 | 30-34 | 0.3 |
| 15-17 | 4.6 | 26-30 | 0.6 |
| 13-15 | 11.0 | 22-26 | 1.8 |
| 11-13 | 22.3 | 18-22 | 1.5 |
| 9-11 | 23.0 | 14-18 | 0.5 |
| <9 | 30.0 | <14 | 2.0 |
