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In pavement design, what does the term 'subgrade' refer to?

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Question: In pavement design, what does the term \'subgrade\' refer to?

Options:

  1. The top layer of the pavement
  2. The layer of soil beneath the pavement
  3. The drainage layer
  4. The layer of asphalt

Correct Answer: The layer of soil beneath the pavement

Solution: 

The subgrade refers to the layer of soil beneath the pavement that supports the pavement structure.

In pavement design, what does the term 'subgrade' refer to?

Practice Questions

Q1
In pavement design, what does the term 'subgrade' refer to?
  1. The top layer of the pavement
  2. The layer of soil beneath the pavement
  3. The drainage layer
  4. The layer of asphalt

Questions & Step-by-Step Solutions

In pavement design, what does the term 'subgrade' refer to?
  • Step 1: Understand that pavement is the surface layer we drive on, like roads or parking lots.
  • Step 2: Know that beneath this surface layer, there are different layers of materials.
  • Step 3: Identify that the very bottom layer, which is made up of soil, is called the subgrade.
  • Step 4: Realize that the subgrade is important because it supports the weight of the pavement above it.
  • Subgrade Definition – The subgrade is the foundational layer of soil that provides support for the pavement structure above it.
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