What is the purpose of compaction in HMA production?

The purpose of compaction in Hot Mix Asphalt (HMA) production is to achieve maximum density and strength. This process is crucial because it reduces the air voids within the asphalt mix, leading to increased stability, durability, and overall performance of the pavement. When the HMA is compacted properly, it ensures that the layer of pavement can withstand the stresses imposed by traffic loads and environmental conditions.

Maximizing density also helps to improve the resistance of the asphalt to moisture damage, deformation, and cracking. Ultimately, effective compaction contributes to a longer lifespan of the pavement by enhancing its structural integrity and performance characteristics, thus preventing premature failure and the need for costly repairs.