In flexible pavements, different kinds of layers are used to withstand the traffic load. CBR value is required to determine the thickness of those layers, especially for base and subgrade materials.

For lower CBR, the thickness of layers will be higher and vice versa.

If the CBR value of a material is too low, the layer thickness will be much higher. It would not be cost-effective to work with that material.

 

layers of flexible pavement
Schematic of a Flexible Pavement

 

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