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 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
|Initial cost||Their initial cost is low.||Their initial cost is high.|
|Life span||They have short life span.||They have long life span.|
|Thickness||Their thickness is more.||Their thickness is less.|
|Joints||Joints are not required.||Joints are essentially required.|
|Subgrade||A reasonably good subgrade is required.||A good subgrade is not necessary.|
|Durability||They are less durable||They are more durable.|
|Temperature effect||Stresses are not induced in these pavements due to temperature variations.||Heavy stresses are induced in these pavements due to temperature variations.|
|Repair work||Easy repair work.||Difficult to repair.|
|Skill and supervision||Moderate skill and less supervision are required.||More skill and supervision is required.|
|Feasibility of providing underground works||It 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 construction||Can be opened to traffic shortly after construction.||Require curing after construction and thus cause delay in opening to traffic.
|Resiliency||More resilient to traffic load.||Less resilient to traffic load.|
|Corrugations||They 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 resistance||They have more tractive resistance.||They have less tractive resistance.|
|Traffic suitability||Suitable for all types of traffic.||Noisy under iron wheeled traffic.|
|Night visibility||Blacktop pavements provide poor visibility at night.||They offer good visibility at night.|
|Glaring effect||They do not usually cause glare due to reflected sunlight.||They often cause glare due to reflected sunlight.|
|Feasibility of stage development||Stage development is feasible.||Stage development is not feasible.|
|Effect Of loading||They adjust themselves to normal loading by undergoing elastic deformation.||They tend to act as a beam or cantilever and resist deformation.|
|Maintenance cost||Maintenance cost is high.||Maintenance cost is low.|