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The position of base course in a flexible pavement is
  • a)
    over the sub-base
  • b)
    below the sub-base
  • c)
    over the sub-grade but below the sub-base
  • d)
    over the wearing course when renewal of surface is needed
Correct answer is option 'A'. Can you explain this answer?
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Base Course in a Flexible Pavement

The position of the base course in a flexible pavement is over the sub-base.

Flexible Pavement

Flexible pavement is a type of pavement that is constructed with the combination of bituminous materials and unbound materials. The main purpose of the flexible pavement is to distribute the load from the surface course to the underlying layers. The flexible pavement consists of four layers, namely:

1. Wearing Course
2. Base Course
3. Sub-Base Course
4. Sub-grade

Base Course

The base course is the layer of a flexible pavement that is placed immediately above the sub-base course. The base course is made up of any of the following materials:

1. Crushed stone
2. Gravel
3. Coarse sand
4. Bituminous-bound material

Position of Base Course

The position of the base course in a flexible pavement is over the sub-base. This means that the base course is placed immediately above the sub-base course, and below the wearing course.

Importance of Base Course

The base course in a flexible pavement is very important because it provides the following functions:

1. It distributes the load from the surface course to the underlying layers.
2. It provides a stable platform for the vehicles to travel on.
3. It prevents the intrusion of water into the underlying layers.
4. It provides drainage of water from the surface.

Conclusion

In conclusion, the position of the base course in a flexible pavement is over the sub-base. The base course is very important in a flexible pavement as it provides stability, distributes the load, and prevents water intrusion.
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The position of base course in a flexible pavement isa)over the sub-baseb)below the sub-basec)over the sub-grade but below the sub-based)over the wearing course when renewal of surface is neededCorrect answer is option 'A'. Can you explain this answer?
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