Differences between Flexible & Rigid Pavements
Flexible Pavement VS Rigid Pavement
( Composition )
Flexible Pavement
Flexible pavements are composed of properly graded aggregates with bitumen/tar as binder
VS
Rigid Pavement
Rigid Pavements are constructed by using PCC —Cement, Aggregates, Water and Dowel Bars (for joints)
( Stability )
Flexible Pavement
Strength depends upon interlocking of aggregates, friction & cohesion
VS
Rigid Pavement
Strength depends upon the flexural strength of placed concrete
( Design )
Flexible Pavement
Flexible materials are constructed in number of layers.
VS
Rigid Pavement
Rigid Pavements are casted as a single concrete slab with reinforcements
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( Joints )
Flexible Pavement
Flexible Pavements are laid continuously, hence there are no joints
VS
Rigid Pavement
Rigid Pavements are constructed in bays, hence joints are present
( Cost )
Flexible Pavement
Initial Cost is less and maintenance cost is more
VS
Rigid Pavement
Initial costs are high and low maintenance costs
( Load Distribution )
Flexible Pavement
Loads are distributed to underlying layers by grain to grain action
VS
Rigid Pavement
Load is distributed over a wider area of subgrade due to its rigidity and high elastic modulus
( Thermal Stresses )
Flexible Pavement
No thermal stresses developed due to temperature variation
VS
Rigid Pavement
Thermal stresses develops leading to warping
( Traffic )
Flexible Pavement
Can be open to traffic after 24 hours
VS
Rigid Pavement
Can be open to traffic after minimum of 14 days
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