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What is the purpose of a subgrade in pavement design?

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Question: What is the purpose of a subgrade in pavement design?

Options:

  1. To provide drainage
  2. To support the pavement structure
  3. To enhance aesthetics
  4. To reduce construction costs

Correct Answer: To support the pavement structure

Solution: 

The subgrade serves as the foundation that supports the pavement structure and distributes loads to the underlying soil.

What is the purpose of a subgrade in pavement design?

Practice Questions

Q1
What is the purpose of a subgrade in pavement design?
  1. To provide drainage
  2. To support the pavement structure
  3. To enhance aesthetics
  4. To reduce construction costs

Questions & Step-by-Step Solutions

What is the purpose of a subgrade in pavement design?
  • Step 1: Understand that the subgrade is the layer of soil or material beneath the pavement.
  • Step 2: Know that the subgrade acts like a foundation for the pavement above it.
  • Step 3: Realize that the subgrade helps to support the weight of vehicles and other loads on the pavement.
  • Step 4: Learn that the subgrade distributes these loads evenly to prevent damage to the pavement and the soil below.
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