Design of rigid pavements is based on Westergaard’s analysis, where modulus of subgrade reaction, radius of relative stiffness, radius of wheel load distribution are used. For critical design, a combination of load stress, frictional stress and warping stress is considered.
What is the main design criteria for designing the rigid pavement?
What is the main design criterion for designing the rigid pavement? Explanation: Rigid pavement is not flexible i.e. it is not elastic in nature. The deformations once formed due to the tensile stress are not reversible. They tend to develop into big cracks later on.
How do you design pavement thickness?
The thickness design of highway pavements requires the following large number of complex factors to be considered. The magnitude and number of repetitions of the applied wheel loads and the contact area between the tyre carrying the load and the road surface.
What is the structure of rigid pavement?
A rigid pavement structure is typically composed of a PCC surface course built on top of either (1) the subgrade or (2) an underlying base course. Because of its relative rigidity, the pavement structure distributes loads over a wide area with only one, or at most two, structural layers (see Figure 1).
What is pavement design?
A highway pavement is a structure consisting of superimposed layers of processed materials above the natural soil sub-grade, whose primary function is to distribute the applied vehicle loads to the sub-grade. Improper design of pavements leads to early failure of pavements affecting the riding quality.
What is IRC 37?
The Pavement designs given in the previous edition IRC:37-1984 were applicable to design traffic upto only 30 million standard axles (msa). These guidelines will apply to design of flexible pavements for Expressway, National Highways, State Highways, Major District Roads, and other categories of roads.
Which IRC code is used for design of rigid pavement?
2. Which IRC code is used for the design of rigid pavements in rural areas? Clarification: The code for guidelines to design the rigid pavement in rural areas is IRC SP 62:2004. IRC 58:2002 is the code used for the design of rigid pavements for highways.
What is Aashto method?
The current AASHTO method is a regression method based on the results of road tests. The AASHTO method utilizes an index termed the “structural number” (SN) to indicate the required combined structural capacity of all pavement layers overlying the subgrade.
What are the layers of rigid pavement?
The structure of a rigid pavement consists following layers.
- Concrete slab or surface course.
- Granular base or stabilized base course.
- Granular subbase or stabilized subbase course.
- Frost protection layer.
- Subgrade soil.
How do we design pavement?
Conventional flexible pavements are layered systems with high quality expensive materials are placed in the top where stresses are high, and low quality cheap materials are placed in lower layers. Full – depth asphalt pavements are constructed by placing bituminous layers directly on the soil sub-grade.
What are the design parameters for pavement design?
When designing pavements (both mix design and structural design), there are three fundamental external design parameters to consider: the characteristics of the subgrade upon which the pavement is placed, the applied loads and the environment.
What are the different types of rigid pavement?
Rigid pavement types other than CRCP and CPCD may be appropriate for a wide variety of situations. Refer to Section 7, “Bonded and Unbonded Concrete Overlays,” and Section 8, “Thin Concrete Pavement Overlay (Thin Whitetopping),” for a description of other rigid pavement applications.
What are the different types of concrete paving?
Through the use of reinforcement, the location and spacing of cracks can also be controlled. Two types of concrete pavements commonly used in Texas are continuously reinforced concrete pavement (CRCP) and concrete pavement contraction design (CPCD), which is also called jointed concrete pavement (JCP).
How long does a rigid pavement overlay last?
Refer to Section 7, “Bonded and Unbonded Concrete Overlays,” and Section 8, “Thin Concrete Pavement Overlay (Thin Whitetopping),” for a description of other rigid pavement applications. For rigid pavements, the initial pavement structure shall be designed and analyzed for a performance period of 30 yr.
What is the minimum thickness of pavement in New York State?
Due to established policies in many jurisdictions across the state, the minimum pavement thickness for streets on natural subgrade was set at 7 inches for rigid pavement and 8 inches for flexible pavement. For pavements with a granular subbase, the minimum thickness was set at 6 inches for both pavement types.
