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

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

Options:

Correct Answer: To support the surface layer

Solution:

The subbase layer provides structural support to the surface layer and helps distribute loads to the subgrade.

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

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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