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The camber value for water bound macadam road is
7 to 2%
2 to 2.5%
5 to 3%
3 to 4.0%
5 to 3%
Camber, or cross-slope, is the transverse inclination provided to the road surface to drain off rainwater. For Water Bound Macadam (WBM) roads, the recommended camber ranges from 1 in 40 to 1 in 33, which corresponds to approximately 2.5% to 3% based on the surface roughness and permeability characteristics of the material.
Camber, or cross-slope, is the transverse inclination provided to the road surface to drain off rainwater. For Water Bound Macadam (WBM) roads, the recommended camber ranges from 1 in 40 to 1 in 33, which corresponds to approximately 2.5% to 3% based on the surface roughness and permeability characteristics of the material.
Camber=n1тАЛ
Percentage┬аCamber=n1тАЛ├Ч100
The principle of camber is to maintain a high-point at the center (crown) and slope towards the edges to minimize the residence time of water on the pavement. This is crucial for WBM roads because water ingress can soften the subgrade and weaken the mechanical interlock of the aggregates, leading to early surface failure.
Camber is essential for shedding surface water.
Steeper cambers are required for rougher or porous road surfaces like WBM.
Flatter cambers are used for impervious surfaces like Cement Concrete or Bituminous concrete.
IRC (Indian Roads Congress) provides specific guidelines for camber based on rainfall intensity and road type.
Prevents water stagnation on the road surface.
Protects the foundation and subgrade from moisture-related weakening.
Excessive camber causes discomfort to drivers and potential lateral displacement of vehicles.
Too much camber can lead to shoulder erosion due to concentrated runoff.
Rural road development
Temporary haul roads
Low-volume traffic pavements
For heavy rainfall areas and WBM surfaces, the camber can be as high as 3% (1 in 33).
Option A (1.7-2%) is typically used for high-type bituminous surfaces in moderate rainfall areas.
C is correct тАФ For WBM roads, the standard range for camber is 2.5% to 3% to ensure efficient drainage.
Always remember: 'Rougher surface = Steeper Camber'. WBM is rougher than Bituminous, so it requires a higher camber value compared to smooth asphalt roads.