Arrange the component of flexible pavement structure from bottom to the top.

I. Granular base course

II. Bituminous binder

III. Granular sub-base cum drainage layer

IV. Prepared soil subgrade 

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HPCL Engineer Civil 23 Dec 2023 Official Paper
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  1. III, II, I, IV
  2. III, II, IV, I
  3. IV, III, II, I
  4. IV, III, I, II

Answer (Detailed Solution Below)

Option 4 : IV, III, I, II
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Flexible pavements: Flexible pavements are so named because the total pavement structure deflects, or flexes, under loading.

RRB JE CE R40 15Q TRE&WaterResouces Rohit Nitesh Hindi.docx 2

Flexible pavement may be constructed in a number of layers and the top layer has to be of the best quality to sustain maximum compressive stress, in addition, to wear and tear. The lower layers will experience the lesser magnitude of stress and low-quality material can be used.

∴ The order of the components of a typical flexible pavement from bottom to top is prepared soil subgrade, Granular sub-base cum drainage layer, Granular base course, Bituminous binder, and/or surface course.
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