Practice question

For most dense-graded HMA mixes, when should breakdown and intermediate rolling generally be finished relative to mat temperature?

  1. After the mat has cooled below 100°F so the rollers will not leave marks
  2. While the mat is still hot and workable, typically before it cools to about 175°F
  3. Only after a 24-hour cure, the same as Portland cement concrete
  4. Only when the plant mixing temperature exceeds 400°F

Answer: B — While the mat is still hot and workable, typically before it cools to about 175°F

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