What is meant by rigid pavement?

What is meant by rigid pavement?

Rigid pavement is the technical term for any road surface made of concrete. Concrete roads are called rigid while asphalt-covered roads are flexible. A surface layer, made up of slabs of Portland cement concrete (PCC), sits on top of a handful of sub-layers.

What is rigid pavement and its types?

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

What is the rigid pavement used for?

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 is difference between rigid and flexible pavement?

Flexible pavements tend to have more layers and are therefore much thicker by default. Rigid pavements have fewer layers and are thinner than flexible pavements, which makes them susceptible to more repairs over time.

What are the three types of pavement?

Pavement Types

• Flexible pavements. Those which are surfaced with bituminous (or asphalt) materials. These types of pavements are called “flexible” since the total pavement structure “bends” or “deflects” due to traffic loads.
• Rigid pavements. Those which are surfaced with portland cement concrete (PCC).

What is subgrade in pavement?

In transport engineering, subgrade is the native material underneath a constructed road, pavement or railway track (US: railroad track). It is also called formation level. The term can also refer to imported material that has been used to build an embankment.

What is rigid pavement in civil engineering?

Pavement, in civil engineering, durable surfacing of a road, airstrip, or similar area. Rigid pavements are made of concrete, composed of coarse and fine aggregate and portland cement, and usually reinforced with steel rod or mesh.

What are the types of pavement?

Types of Rigid Pavements Jointed plain concrete pavement (JPCP), Jointed reinforced concrete pavement (JRCP), Continuous reinforced concrete pavement (CRCP), and. Pre-stressed concrete pavement (PCP).

How many layers are there in 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).

Which type of pavement is less rigid?

Flexible pavement
Flexible pavement, inherently built with weaker and less stiff material, does not spread loads as well as concrete. Therefore flexible pavements usually require more layers and greater thickness for optimally transmitting load to the subgrade.

What is CBR value?

The California Bearing Ratio (CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering.

What is a good CBR?

What are the typical CBR values? The harder the material, the higher the CBR value. A CBR value of 2% is usually found for clay, high-quality sub-base will have CBR values between 80% and 100%, and some sands may have values around 10%. The CBR testing can be applied to soils with a maximum particle size of 20 mm.

What does rigid pavement mean in construction terms?

1. Introduction The pavement having high flexural strength is called rigid pavement. It is simply a concrete road that may be either RCC or PCC. Rigid Pavement is divided into different slabs during construction and a small gap is provided between the slabs so that concrete doesn’t crack during expansion on summer days.

How does rigid pavement support the natural soil layer?

Rigid pavements support loads through rigidity and high modulus of elasticity of concrete slab. The loads will distribute to natural soil layer through different layers of rigid pavement.

Why do you need a base course for rigid pavement?

This course helps the surface course to take additional loads. It provides stable platform to construct rigid pavement It is also useful to provide sub surface drainage system. In frost areas, the frost action can be controlled by the stabilized base course. It helps to control swelling of subgrade soil.

How is the subgrade modulus of rigid pavement determined?

The supporting layers of the rigid pavement such as subgrade, sub-base layer and base course layers are decided and the subgrade modulus is either determined or estimated. The spacing between the longitudinal joints, Lc to provided, during the initial period of curing.