Those which are surfaced with portland cement concrete (pcc). The slab action in the rigid pavement can distribute the heavy loads over the whole area and below the courses of pavement Design of rigid pavements is based on westergaard’s analysis, where modulus of subgrade reaction, radius of relative stiffness, radius.
PPT FLEXIBLE PAVEMENT PowerPoint Presentation ID474034
Short service life, usually 15 years.
These types of pavements are called “flexible” since the total pavement structure “bends” or “deflects” due to traffic loads.
Pavement designs •composition of road pavement: The rigid pavements can be analyzed by the plate theory. Those which are surfaced with portland cement concrete (pcc). 26 rows flexible pavement:
Introduction rigid pavements are those which possess note worthy flexural strength or flexural rigidity.
Initial construction cost is high. These types of pavements are called “flexible” since the total pavement structure “bends” or “deflects” due to traffic loads. In case of the flexible pavement the loads are deflected from grain to grain but in case of rigid pavement the deflection is not so appreciable, but the load is distributed over a large are underneath the surface course. Flexible pavement uses more flexible surface course and distributes loads over a smaller area.
Types of road pavement pdf.
Flexible pavements are easy to construct and have cheaper cost than c. Rigid pavement has a concrete layer at the top, the base course and soil subgrade are under it. A flexible pavement structure is generally composed of several layers of materials which can accommodate this “flexing”. These types of pavements are called “rigid” because they are substantially stiffer than.
Rigid pavements, on the other hand, can often serve 20 to 40 years with little or no maintenance or rehabilitation.
Comparative analysis of flexible and rigid pavement design. 4th international conference contemporary achievements in civil engineering, subotica, serbia. The thickness of this pavement is more: Initial construction cost is low. Long service life, more than 30 years.
Joints are required in flexible pavements
Flexible pavement has very low modulus of elasticity (less strength). The initial cost of flexible pavement is low: The pavement design is also one major factor, with flexible pavements reliant on subgrade strength and rigid pavement dependent on the flexural strength of concrete. Rigid pavement can distribute the load over a wide.
The stresses are not transferred from grain to grain to the lower layers as in the case of flexible pavement layers.
Difference between flexible and rigid pavement: Design life is 15 years. Functions •good riding surface •resistance to weathering and vehicle load conditions •structural stability to. Load is transmitted through the slabs to the underlying subgrade by flexure of the slabs.
Flexible pavement shows the deflection of subgrade at the surface of the pavement.
The thickness of this pavement is less: It transfers the wheel load to subgrade by grain to grain mechanism. The load is distributed by the slab action mechanism. Rigid pavements are constructed of portland cement concrete slabs resting on a prepared subbase of granular material or directly on a granular subgrade.
Pavement design methods, developing guidelines with a protocol for considering rigid versus flexible pavement designs when allowed alternate bids, and developing the alternate pavement design analysis tool (apdat) for pavement type analysis.
Those which are surfaced with bituminous (or asphalt) materials. The span of rigid pavement is long. Flexible pavements can be defined as one consisting of a mixture of asphaltic or bituminous materials and aggregate placed on a bed of compacted granular material of appropriate quality in layers over the subgrade. Rigid pavements are constructed from cement.
Rigid pavement has a good flexural strength which serves as the major factor of design.
Which of the following method is used to design rigid pavement? The rigid characteristic of the pavement are associated with rigidity or flexural strength or slab action so the load is distributed over a wide area of subgrade soil. Flexible pavements are those pavements which reflect the deformation of subgrade and the subsequent layers to the surface. Modulus of elasticity of rigid pavement is very high, because of high strength concrete and more load bearing capacity of the pavement itself.
Flexible pavements are constructed of several thicknesses.
Since the top layer alone does not have to bear the entire load of traffic (weight is distributed amongst all the layers), flexible pavement are more structurally sound and much less likely to collapse due to heavyweight. It relies on a combination of layers for transmitting load to the subgrade. Than compared to flexible pavements. The initial cost of rigid pavement is high.
The span of flexible pavement is short.
These types of pavements are called “rigid”. Rigid pavement are difficult to install and maintain. C pavements and also they are easily accessible to the users. In flexible pavements, underlying layers play very important role.
It transfers the wheel load to subgrade by slab action.
