The pavements having high flexural strength is called rigid pavement. It is simply a concrete road that may be either RCC or PCC. Rigid Pavement is divided into different slabs during construction and a small gap is provided between slabs so that concrete doesn’t crack during expansion in summer days. Unlike flexible pavements; rigid pavements act as a slab and it is capable of transmitting wheel load stresses to a wider area beneath by the slab action. Rigid pavements do not show deformation on pavement surface or deformation of lower layers due to the rigidity of the cement concrete slab.
Fig: Load transfer action
Some examples of this pavements are PCC pavements, RCC pavements and Prestressed concrete pavement.
a. Jointed plain concrete pavement (JPCP)
a. Jointed reinforced concrete pavement (JRCP)
b.Continuously reinforced concrete pavement (CRCP)
3.Pre-stressed Concrete Pavement
Requirements of Good Rigid Pavement
– Long-life design with low maintenance cost.
– It should be impervious enough to protect sub-grade soil.
– Should have a high coefficient of friction to resist skidding.
– It should be smooth enough to provide comfort to the users.
– Should be structurally strong to withstand all types of loads.
Advantages of Rigid Pavement
– Low maintenance and operation cost.
– Higher life span ( Life span may be up to 40 years whereas flexible pavement has a life span of only 10-20 years).
– It has high flexural strength.
– It has good resistance to petroleum products, oils and chemicals.
– More environment-friendly than flexible pavement.
– It distributes loads in a wider area and is able to bear a large amount of load due to slab action.
Dis-advantages of Rigid Pavement
– High initial cost required for construction.
– Maintenance is difficult than flexible pavement.
– Requires at least 28 days of curing before traffic movement because concrete gains its 99% efficiency/strength in 28 days.
– Any excessive deformations occurring due to heavier wheel loads are not recoverable in this pavement type( settlement is permanent).
– Compact subgrade (Existing Soil).
– Provision of sub-base course if necessary.
– Built non-erosive base coarse with boulders and stones maintaining slopes for water disposal purpose.
– Construct the slab of concrete above the base course (either with RCC or PCC ).
1.They are also called single layer pavement.
2.They may last up to 50-60 years if timely maintenance is done.
3.They may require asphalt for toping to reduce the noise during vehicle operation.
4.The vehicle operation cost of rigid pavement is low.
5.They cheaper while considering the life-cycling cost.
6.Deflection is very low. so, it is called rigid pavement.
7.Maintenance cost is very low.