The sub-base layer in a flexible pavement primarily functions to:
Choose the correct answer
Distribute wheel loads directly to subgrade
Provide a working platform, drainage, and secondary load distribution between base and subgrade
Provide wearing surface for traffic
Carry the maximum bending stress
Correct Answer
B. Provide a working platform, drainage, and secondary load distribution between base and subgrade
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Sub-base (granular sub-base, GSB) serves as: working platform for construction, drainage layer (longitudinal drainage), frost protection layer, and secondary structural layer reducing stress on subgrade. It does not carry the maximum structural load (base does).
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