Practice question

A Superpave binder is graded PG 64-22. What do the two numbers mean?

  1. 64% binder and 22% air voids in the job-mix formula
  2. The binder is intended to perform up to an average 7-day maximum pavement temperature of 64°C and down to a minimum pavement temperature of −22°C
  3. The mix must be produced at 64°F and compacted at 22°F
  4. The binder penetration is 64 at 22°F

Answer: B — The binder is intended to perform up to an average 7-day maximum pavement temperature of 64°C and down to a minimum pavement temperature of −22°C

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