Quick Answer: How Temperature Stresses Are Found In Rigid Pavement?

How many layers are in flexible pavement?

Typical layers of a flexible pavement Typical layers of a conventional flexible pavement includes seal coat, surface course, tack coat, binder course, prime coat, base course, sub-base course, compacted sub-grade and natural sub- grade..

Is code for cement concrete road?

IRC: 15-2011 specified that for concrete roads OPC should be used. This code also allowed PPC as per IS: 1489 (Part-1) with flyash content not more than 20 percent by weight of PPC. Accordingly OPC + fly ash may be used in concrete roads. Flyash shall be not more than 20 percent by weight of cementitious material.

What are the factors considered in design of rigid pavement?

In addition, factors specific to rigid pavement design are given below:Provision of Sub-Base/Base: … Properties of Cement Concrete: … Temperature Changes: … Reinforcements: … Joints: … Friction between Pavement Slab and Soil Below: … Special Considerations Regarding Wheel Load and Repetitions:

What are the major stresses calculated in CC pavement design?

The major types of stresses in CC pavements consists of: a) Wheel load stresses caused by heavy wheel loads b) Warping stresses caused by temperature differential between the top and bottom of the pavement.

Where are rigid pavements used?

There are two main types of road construction. “Rigid pavement,” such as concrete, can only be used on stable ground. “Flexible pavement,” such as bituminous materials, as described below, can be used on ground where some movement is expected.

What stresses are induced in rigid pavement?

Temperature stresses are developed in cement concrete pavement due to variation in slab temperature. This is caused by (i) daily variation resulting in a temperature gradient across the thickness of the slab and (ii) seasonal variation resulting in overall change in the slab temperature.

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.

What is difference between rigid and flexible pavement?

Rigid pavements on the other hand, are made from cement concrete or reinforced concrete slabs, laid over a low strength concrete layer (Dry lean concrete, DLC) or on a well compacted layer of aggregates or both. A typical flexible pavement consists of a bituminous surface course over base course and sub-base course.

What are the main external parameters influencing pavement design?

The performance of a pavement is influenced by many factors, including gross applied load, tire pressure, number of load applications, thickness and durability of the various pavement components, and the mechanical properties of the pavement materials.

How thick is pavement on a road?

6-12 inchesThis fact is a common rule of thumb which can be used in most situations involving concrete pavement thickness design for street and highway pavements (6-12 inches).

What is the most commonly used overlay?

Polyester overlaysPolyester overlays are the most frequently utilized material for overlays as it is the most commonly used plastic in the world.

What is the minimum thickness of seal coat?

20mmExplanation: The minimum thickness of the seal coat required is 20mm for bitumen pavement, seal coat is a layer above the flexible pavement surface. Explanation: The aggregate impact value should not be more than 30% for aggregate used in bitumen if it is less than 30 the aggregate may be replaced.

What is the last step in the design of flexible pavement?

What is the last step in the design of flexible pavement? Explanation: The last step in the design of the pavement is design of pavement thickness, after design of mix, design of sub grade, sub base and base. Explanation: If one or more wheels act as a single load then it is called as an equivalent single wheel load.

What is the critical location for stress calculation for design of rigid pavement?

Also, the frictional stresses will be tensile because, there is overall contraction of the pavement due to lower average temperature and therefore friction will act along the tensile direction. So, the Critical stress combination(At the edge) = Traffic stress + Warping stress + frictional stress.

How do you make a rigid pavement?

 A course of material is placed on the sub grade to provide drainage and stability.  A course of fairly rigid material, sometimes cement- or asphalt- treated, that is placed on the sub base to provide a stable platform for the concrete pavement slab. 12. CONSTRUCTION BY SLIP FORM PAVER 1.

What is the most commonly used type of concrete pavement?

unreinforcedWhat is the most commonly used type of concrete pavement? Explanation: The most commonly used type is unreinforced, dowels and ties are not considered as reinforcements in slab.

What is the maximum fatigue ratio of rigid pavement?

0.45 to 0.98. What is the maximum fatigue ratio of rigid pavement? Explanation: For a rigid pavement the fatigue ratio of the pavement is 0.45 to 0.9, in any case the value should not exceed 0.9. Explanation: The ratio of flexibility strength due to a load and it’s original flexural strength is called stress ratio.

Is pavement design a code?

The Pavement designs given in the previous edition IRC:37-1984 were applicable to design traffic upto only 30 million standard axles (msa). The earlier code is empirical in nature which has limitations regarding applicability and extrapolation.

What are four factors to be considered in the design of a road or highway?

These elements include super-elevation, the alignment and the grades. Other elements include width, clearance and side slope ratio.

What are the types of rigid pavement?

Rigid pavements can be classified into four types:Jointed plain concrete pavement (JPCP),Jointed reinforced concrete pavement (JRCP),Continuous reinforced concrete pavement (CRCP), and.Pre-stressed concrete pavement (PCP).

What is the meaning of rigid pavement?

Rigid pavements are constructed of portland cement concrete slabs resting on a prepared subbase of granular material or directly on a granular subgrade. Load is transmitted through the slabs to the underlying subgrade by flexure of the slabs. Flexible pavements are constructed of several thicknesses…