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What is the primary function of a subbase layer in pavement design?

Practice Questions

Q1
What is the primary function of a subbase layer in pavement design?
  1. To provide drainage
  2. To enhance aesthetic appeal
  3. To reduce noise
  4. To support the surface layer

Questions & Step-by-Step Solutions

What is the primary function of a subbase layer in pavement design?
  • Step 1: Understand that the pavement has multiple layers, including the surface layer, subbase layer, and subgrade.
  • Step 2: Recognize that the subbase layer is located beneath the surface layer and above the subgrade.
  • Step 3: Learn that the primary function of the subbase layer is to provide structural support to the surface layer.
  • Step 4: Know that the subbase layer helps to distribute the weight (or loads) from vehicles and other objects on the surface layer.
  • Step 5: Realize that by distributing these loads, the subbase layer protects the subgrade (the ground underneath) from damage.
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