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PAVEMENT:
There are two types of pavements based on design considerations i.e. flexible pavement and rigid pavement. Difference between flexible and rigid pavements is based on the manner in which the loads are distributed to the subgrade.
Before we differentiate between flexible pavements and rigid pavements, it is better to first know about them. Details of these two are presented below:
Flexible Pavements:
Flexible pavement can be defined as the one consisting of a mixture of asphaltic or bituminous
material and aggregates placed on a bed of compacted granular material of appropriate quality in
layers over the subgrade. Water bound macadam roads and stabilized soil roads with or without
asphaltic toppings are examples of flexible pavements.
The design of flexible pavement is based on the principle that for a load of any magnitude, the
intensity of a load diminishes as the load is transmitted downwards from the surface by virtue of
spreading over an increasingly larger area, by carrying it deep enough into the ground through
successive layers of granular material.
Rigid Pavements:
A rigid pavement is constructed from cement concrete or reinforced concrete slabs. Grouted
concrete roads are in the category of semi-rigid pavements.
The design of rigid pavement is based on providing a structural cement concrete slab of
sufficient strength to resists the loads from traffic. The rigid pavement has rigidity and high
modulus of elasticity to distribute the load over a relatively wide area of soil.
Rigid Pavement Cross-Section
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