Flexible Pavements Rigid Pavements
It consists of a series of layers with the highest quality materials at or near the surface of pavement. It consists of one layer Portland cement concrete slab or relatively high flexural strength.
It reflects the deformations of subgrade and subsequent layers on the surface. It is able to bridge over localized failures and area of inadequate support.
Its stability depends upon the aggregate interlock, particle friction and cohesion. Its structural strength is provided by the pavement slab itself by its beam action.
Pavement design is greatly influenced by the subgrade strength. Flexural strength of concrete is a major factor for design.
It functions by a way of load distribution through the component layers. It distributes load over a wide area of subgrade because of its rigidity and high modulus of elasticity.
Temperature variations due to change in atmospheric conditions do not produce stresses in flexible pavements. Temperature changes induce heavy stresses in rigid pavements.
Flexible pavements have self healing properties due to heavier wheel loads are recoverable due to some extent. Any excessive deformations occurring due to heavier wheel loads are not recoverable, i.e. settlements are permanent.