Practice question

Why does cold, windy weather make HMA compaction more difficult on a thin lift?

  1. The mix stays above 300°F longer, so rollers have too much time
  2. The mat loses heat faster, shortening the time the mix is still compactable
  3. Asphalt hydrates more slowly in the cold, like concrete
  4. Tack coat freezes into a structural slab that replaces the HMA

Answer: B — The mat loses heat faster, shortening the time the mix is still compactable

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