The value of camber recommended for cement concrete roads in areas of heavy rainfall is
- A1 in 25
- B1 in 33
- C1 in 40
- D1 in 50Correct
Solution
Concept
Recommended camber for cement concrete roads
Formula
NONE
Step-by-step solution
1. Camber is provided on roads to drain off surface water rapidly. 2. Rigid pavements such as cement concrete roads require flatter cambers compared to flexible roads because of their smooth surface. 3. IRC specifies a camber of 1 in 50 (2.0%) for cement concrete roads in heavy rainfall regions. Answer: D
Explanation
Cement concrete surfaces are smooth and allow rainwater to run off easily compared to bituminous surfaces. For areas experiencing heavy rainfall, the Indian Roads Congress recommends a camber of 2 percent, which is equivalent to a slope ratio of 1 in 50. In light rainfall zones, a flatter slope of 1 in 60 is specified.
Why the other options are wrong
A) 1 in 25 is recommended for earth roads in heavy rainfall regions. B) 1 in 33 is recommended for thin bituminous surfaces in heavy rainfall regions. C) 1 in 40 is recommended for thin bituminous surfaces in light rainfall regions.
Shortcut
Cement concrete road camber: 1 in 50 (2%) for heavy rainfall, 1 in 60 (1.7%) for light rainfall.
Common mistake
Selecting a steeper slope like 1 in 40 for heavy rainfall instead of the flatter 1 in 50 required for cement concrete roads.
Correct answer: D) 1 in 50