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Q: The order of the components of a typical flexible pavement from bottom to top is :
  • A. Prepared soil subgrade, Granular base course, Granular sub-base cum drainage layer, Bituminous binder and/or surface course
  • B. Prepared soil subgrade, Granular sub-base cum drainage layer, Granular base course, Bituminous binder and/or surface
  • C. Granular base course, Bituminous binder and/or surface course, Prepared soil subgrade, Granular sub-base cum drainage layer
  • D. Granular sub-base drainage layer, Prepared soil subgrade, Granular base course, Bituminous binder and/or surface course
Correct Answer: Option B - • The order of the component of a typical flexible pavement from bottom to top is– Prepared soil subgrade → Granular sub-base cum drainage layer → Granular base course → Bituminous binder or surface. • The method of design of flexible pavement as recommended by IRC is CBR method.
B. • The order of the component of a typical flexible pavement from bottom to top is– Prepared soil subgrade → Granular sub-base cum drainage layer → Granular base course → Bituminous binder or surface. • The method of design of flexible pavement as recommended by IRC is CBR method.

Explanations:

• The order of the component of a typical flexible pavement from bottom to top is– Prepared soil subgrade → Granular sub-base cum drainage layer → Granular base course → Bituminous binder or surface. • The method of design of flexible pavement as recommended by IRC is CBR method.