Difference Between Flexible Pavements And Rigid Pavements

Flexible Pavements:

The pavements having low or negligible flexural strength and are flexible in their structural action under the loads are known as flexible pavements.

Rigid Pavements:

Rigid pavements are those which contain great amount of flexural strength or flexural rigidity.

In rigid pavements, the stresses are not transferred from grain to grain to the lower layers as in the ease of flexible pavement layers.

Difference Between Flexible Pavements And Rigid Pavements:

Point Of Difference

Flexible Pavements

Rigid Pavements

Initial costTheir initial cost is low.Their initial cost is high.
Life spanThey have short life span.They have long life span.
ThicknessTheir thickness is more.Their thickness is less.
JointsJoints are not required.Joints are essentially required.
SubgradeA reasonably good subgrade is required.A good subgrade is not necessary.
DurabilityThey are less durableThey are more durable.
Temperature effectStresses are not induced in these pavements due to temperature variations.Heavy stresses are induced in these pavements due to temperature variations.
Repair workEasy repair work.Difficult to repair.
Skill and supervisionModerate skill and less supervision are required.More skill and supervision is required.
Feasibility of providing underground worksIt is easy to lay, locate or repair underground pipes below these pavements.It is very difficult to provide or repair underground pipes below these pavements.
Openings to traffic after constructionCan be opened to traffic shortly after construction.Require curing after construction and thus cause delay in opening to traffic.

 

ResiliencyMore resilient to traffic load.Less resilient to traffic load.
CorrugationsThey develop corrugations.No corrugations are developed in these pavements.
Behavior with subgrade settlement.They adjust according to any deformation of subgrade without rupture.They do not adjust according to any deformation of subgrade without rupture.
Tractive resistanceThey have more tractive resistance.They have less tractive resistance.
Traffic suitabilitySuitable for all types of traffic.Noisy under iron wheeled traffic.
Night visibilityBlacktop pavements provide poor visibility at night.They offer good visibility at night.
Glaring effectThey do not usually cause glare due to reflected sunlight.They often cause glare due to reflected sunlight.
Feasibility of stage developmentStage development is feasible.Stage development is not feasible.
Effect Of loadingThey adjust themselves to normal loading by undergoing elastic deformation.They tend to act as a beam or cantilever and resist deformation.
Maintenance costMaintenance cost is high.Maintenance cost is low.
Also Read – Difference Between Bridge And Culvert.

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