Types Of The Road Camber – Advantages & Methods Of Providing Camber
What Is The Camber ?
Camber is the slope provided to Road Surface in the transverse direction to drain off the rainwater from the road surface. It is also known as cross slope of the road.
In this article, We will briefly discuss types of the camber used in road.
Why Camber Is Provided In The Road ?
1. To protect the road by preventing the entry of the surface water into the subgrade soil through the pavement.
2. To prevent the entry of the water into the bituminous pavement layers.
3. To remove the rainwater from the pavement surface as quickly as possible & to allow the pavement to get dry soon after the rain.
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Types Of The Camber In Road
1 – Sloped Or Straight Camber
It consists of 2 straight slopes from the edges joining at the center of the carriageway. This type of the camber is very simple & can be easily constructed & maintained.
2 – Parabolic Or Barrel Camber
It consists of the continuous Curve either elliptical or parabolic. It provides a flat road surface at the middle & steeper towards the edges. On account of the steeper edges, this type of the camber provides better drainage property. This camber is therefore preferred by fast – moving vehicles & suggested for the urban roads.
This type of the camber is difficult to construct & maintain. The barrel camber has steeper edges which are the inconvenient to use. Moreover, the steeper edges are errored quickly & hence additional kerbs are to be provided.
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3 – Composite Camber
It consists of 2 straight slopes from the edges with a parabolic or circular crown in center of the camber. This type of the camber can be easily constructed & maintained.
Advantages Of The Camber In Road
1 – Camber provides quick drainage of the rainwater & thus saves the foundation course of the road structure from weakening by the percolation of the rainwater to it through the road surface.
2 – This prevents rainwater to accumulate in the local shrinkages or depressions & forming water pools on the road surface, which are disagreeable to the public as well as to the road structure.
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Method Of The Providing Camber In Road
Usually, Camber is the provided on the straight roads by raising the center of the carriageway with respect to the edges, forming a crown or highest point on centerline.
At horizontal Curves with the Super-Elevation, the Surface drainage is affected by raising the outer edge of the pavement with respect to the inner edge while providing the desired Super-Elevation.
The rate of the Camber or cross slope is usually designed by One in ‘ n ’ which means the transverse slope is in ratio one vertical to “ n ” horizontal. The Camber is also expressed in the percentage. If the camber is x %, the cross slope is x in Hundred.
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