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The pavement suitable for heavy traffic load is
Asphalt concreting
Bituminous grouted macadam
cement concrete
surface dressed macadam
cement concrete
Cement concrete pavements, classified as rigid pavements, are the most suitable for heavy traffic loads because they distribute the load over a wider area of the subgrade due to the high flexural strength of the concrete slab ┬╖ Unlike flexible pavements that deform under load, rigid pavements rely on the structural strength of the slab itself to support traffic.
Cement concrete pavements, classified as rigid pavements, are the most suitable for heavy traffic loads because they distribute the load over a wider area of the subgrade due to the high flexural strength of the concrete slab ┬╖ Unlike flexible pavements that deform under load, rigid pavements rely on the structural strength of the slab itself to support traffic.
S=h20.316PтАЛ[4log10тАЛ(blтАЛ)+1.069] тАФ Westergaard's equation for edge stress calculation
╧ГmaxтАЛ=IMcтАЛ тАФ Flexural stress in a concrete beam/slab
In a rigid pavement, the concrete slab acts like a beam or plate ┬╖ When a load P is applied, the internal stresses are governed by the Westergaard's stress equations ┬╖ The high modulus of elasticity (EcтАЛ) of cement concrete ensures minimal deflection under heavy axle loads, distributing pressure effectively to the underlying layers (base/subgrade) and preventing shear failure.
Rigid pavements have a high modulus of rupture compared to bituminous layers.
The load-spreading ability of rigid pavement is significantly higher due to the 'slab action'.
Suitable for high-density heavy vehicle traffic such as airports and national highways.
Maintenance requirement is generally lower over the service life compared to flexible pavements.
High structural strength and durability.
Resistance to oil and fuel spillage.
Longer service life (up to 30-40 years).
High initial construction cost.
Complex joint maintenance and repair.
Risk of slab cracking due to thermal expansion/contraction.
Airport runways and taxiways.
Heavy industrial loading zones.
Urban arterial roads with high axle loads.
| Feature | Cement Concrete | Bituminous |
|---|---|---|
Load Distribution | Slab action (Rigid) | Grain-to-grain transfer (Flexible) |
Rigid pavement refers to cement concrete roads, while flexible pavement refers to bituminous or asphalt roads.
Option A and B are examples of flexible pavements which are more susceptible to deformation under extreme heavy loading compared to concrete slabs.
C is correct тАФ Cement concrete pavement, being a rigid pavement, possesses high flexural strength and distributes heavy traffic loads over a larger area of the subgrade.
Always remember that rigid pavements (concrete) distribute load via slab action, whereas flexible pavements (bitumen) distribute load via grain-to-grain contact; this is the fundamental reason for their performance differences.