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Comparison of Flexible pavements and Rigid Pavements.

written 5.3 years ago by teamques10 ★ 68k

transportation engineering

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written 5.3 years ago by teamques10 ★ 68k

Sr. No.	Flexible Pavement	Rigid Pavement
1.	The earthen, gravel, water bound macadam and bituminous roads are known as flexible pavement.	Cement concrete roads are known as rigid pavement.
2.	In flexible pavement, the top surface takes to shape of the sub surface soil.	The rigid pavement have more stiffness and capacity to bridge over loose soil pockets in the sub grade.
3.	Due to more stiffness and thickness, there are no ups and downs on concrete roads.	Due to flexibility, there are ups and downs on WBM roads and bituminous roads, but there is no ups and down in case of rigid pavement.
4.	Design principle based on load distribution characteristics of the components.	Designed and analysed by using the elastic theory.
5.	Granular material is used in flexible pavement.	Cement concrete either plain reinforced or pre stressed concrete is used in rigid pavement.
6.	It has low or negligible flexural strength.	It is associated with rigidity or flexural strength or slab action so the load is distributed over a wide area of sub-grade soil.
7.	Elastic deformation due to normal loading.	Acts as a beam or cantilever for normal loading.
8.	Local depression due to excessive loading.	Causes cracks due to excessive loading.
9.	Transmits vertical and compressive stresses to the lower layer.	Tensile stress and temperature stress increase.
10.	It is constructed in the number of layers in design practice.	It is laid in slabs with steel reinforcement in design practice.
11.	Road can be used for traffic within 24 hours.	Road cannot e used until 14 days of curing.
12.	Rolling f surfacing is required.	Rolling of the surfacing is not required.
13.	Initial cost is low.	Initial cost is high.
14.	Life span is short.	Life span is long.
15.	Their thickness is more.	Their thickness is less.

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