Practice question

How does stone-matrix asphalt (SMA) differ from a conventional dense-graded HMA wearing course?

  1. SMA has almost no coarse aggregate and relies on sand only
  2. SMA is a gap-graded, stone-on-stone mix with a rich mortar (often with fiber) for rut resistance and durability
  3. SMA is a cold emulsion mix that is never compacted
  4. SMA is used only as a prime coat on aggregate base

Answer: B — SMA is a gap-graded, stone-on-stone mix with a rich mortar (often with fiber) for rut resistance and durability

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