Rigid pavement and Flexible pavement
- Flexible pavement are composed of properly graded aggregate with bitumen/ tar as binder.
- Rigid pavements are constructed by using PCC- cement, aggregate, water and dowel bars (for joints).
- Strength depends upon interlocking of aggregates, friction and cohesion.
- strength depends upon the flexural strength of place concrete
- Flexible materials are constructed in numbers of layers.
- Flexible road and flex asphalt are these having multi layer of poured concrete, rock and asphelt
4 . Joints
- Flexible Pavement are laid continuously, hence there are no joints.
- Rigid Pavements are constructed in bays , hence joints and present
- (Flexible Pavement) initial cost is less and maintenance cost is more.
- (Rigid Pavements) initial cost are high and low maintenance costs.
6. Load Distribution
- (Flexible Pavement) load are distributed to underlying layers by grain to grain action.
- (Rigid Pavements) load is distributed over a wider area of sub-grade due to its rigidity and high elastic modulus.
7. Thermal Stress
- (Flexible Pavement) No thermal stresses developed due to temperature variation.
- (Rigid Pavement) thermal stresses developed leading to warping.
- (Flexible Pavement) can be open to traffic after 24 hours.
- (Rigid Pavement) cab be open to traffic after minimum 14 days.