What does compaction equipment accomplish in the pavement?

• A. Exerts force into the pavement through weight and/or dynamic vibration
• B. Applies asphalt binder
• C. Cools the mat
• D. Compacts air voids by chemical reaction

Answer: (A)

Compaction equipment densifies the asphalt layer by applying force into the pavement through its weight and, when needed, dynamic vibration. This mechanical action squeezes out trapped air and rearranges the aggregate and binder so the mix packs more tightly, creating a denser, stronger, and less permeable surface. The process relies on heat and pressure to close air voids, not on adding material or triggering chemical changes. So the primary purpose is to compact air voids by applying weight and vibration, rather than applying binder, cooling the mat, or relying on a chemical reaction to remove voids.