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What is the role of aggregate gradation in asphalt pavement design?

Practice Questions

Q1
What is the role of aggregate gradation in asphalt pavement design?
  1. To enhance the aesthetic appearance
  2. To improve the load-bearing capacity
  3. To control the thermal expansion
  4. To reduce the cost of materials

Questions & Step-by-Step Solutions

What is the role of aggregate gradation in asphalt pavement design?
  • Step 1: Understand what aggregate gradation means. It refers to the distribution of different sizes of aggregate particles in a mixture.
  • Step 2: Recognize that asphalt pavement is made up of aggregates mixed with asphalt binder.
  • Step 3: Know that the size and proportion of aggregates affect how well they fit together, which influences the strength of the pavement.
  • Step 4: Realize that good gradation helps to create a dense and stable structure that can support heavy loads without cracking.
  • Step 5: Remember that improper gradation can lead to weak spots, which may cause the pavement to fail or wear out quickly.
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