In the design of flexible pavement, the C.B.R. value of the soils and the equivalent load of vehicles are considered for:

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OSSC JE Civil Mains (Re-Exam) Official Paper: (Held On: 3rd Sept 2023)
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  1. Fixing the grade of bitumen concrete used for paving
  2. Fixing the thickness of the pavement crust
  3. Fixing the slope of the pavement curb
  4. Fixing the total width of the pavement

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Option 2 : Fixing the thickness of the pavement crust
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The CBR method of pavement design gives the total thickness requirement of the pavement above a subgrade.

 In revised CBR method for the design of flexible pavement IRC has provided charts for different CBR in which relation between pavement thickness and cumulative traffic axle is given.

In this method, the chart contains several curves (A, B, C, D, E, F, and G) which represent the different levels of traffic intensities. Based on this we can find out the layers thicknesses.
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