Practice question

In a conventional HMA rolling train, what is the usual sequence of roller functions?

  1. Finish roller, then breakdown roller, then pneumatic intermediate roller
  2. Breakdown roller immediately behind the paver, then intermediate roller, then finish roller
  3. Only a pneumatic roller, because steel wheels are not used on HMA
  4. Vibratory rolling only after the mat has cooled below 150°F

Answer: B — Breakdown roller immediately behind the paver, then intermediate roller, then finish roller

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