Recommended value of camber for cement concrete road in heavy rainfall area is ________.
2%
Recommended Camber for Cement Concrete Roads in Heavy Rainfall
Camber, also known as cross slope, is the slope provided to the road surface in the transverse direction. The main purpose of providing camber is to drain off rainwater from the road surface quickly. This prevents water from accumulating on the road, which can damage the pavement structure and reduce friction, making the road unsafe.
The required value of camber depends on two main factors:
- The type of road surface material
- The intensity of rainfall in the area
Different road materials have varying permeability and smoothness, affecting how quickly water flows off. Concrete roads are relatively impermeable and smooth compared to gravel or earth roads.
Rainfall intensity dictates how much water needs to be drained. Areas with heavy rainfall require a steeper camber to handle the larger volume of water effectively, ensuring rapid drainage and preventing waterlogging.
Typical recommended camber values for different road surfaces and rainfall conditions are often summarized as follows:
| Type of Road Surface | Heavy Rainfall Areas | Light Rainfall Areas |
|---|---|---|
| Cement Concrete and High Type Bituminous Surface | \(2.0\%\) | \(1.7\%\) |
| Thin Bituminous Surface | \(2.5\%\) | \(2.0\%\) |
| WBM and Gravel Pavements | \(3.0\%\) | \(2.5\%\) |
| Earth Roads | \(4.0\%\) | \(3.0\%\) |
Based on standard recommendations, for cement concrete roads in heavy rainfall areas, the recommended camber value is \(2.0\%\). This value balances efficient drainage with driving comfort and safety.
Therefore, the recommended value of camber for cement concrete road in heavy rainfall area is \(2\%\).
Important Questions from Highway Geometric Design
The rate of super-elevation for a horizontal curve of radius $500 \text{ m}$ in a national highway for a design speed of $65 \text{ kmph}$ is:
Consider the following statements about grade compensation:
(i) Grade compensation is given up to the maximum value of '75/R', where R is the radius of circular curve in metres.
(ii) According to Indian Roads Congress, grade compensation is not necessary for gradients flatter than 4 percent.
Which of the above statement/s is/are correct?
The type of transition curve that is generally provided on hill road is
The minimum design speed adopted where hair-pin bends are provided at hill roads is _________.
The rear wheels do not follow the same path as that of the front wheels. This phenomenon is called:
