What is the primary purpose of compaction in asphalt pavement construction?

The primary purpose of compaction in asphalt pavement construction is to reduce air voids and increase density. This process is critical for achieving a strong, durable, and stable pavement structure.

When asphalt is compacted, the individual aggregate particles are pressed together more closely, which helps to expel air from the mix. Reducing the air voids not only maximizes the density of the asphalt but also helps to enhance its strength and performance characteristics. A denser pavement is less susceptible to moisture infiltration, reduces the risk of raveling and cracking, and ultimately leads to a longer service life for the pavement.

Achieving the correct density through compaction also ensures better resistance to various stresses, including traffic loads and environmental conditions. Thus, the focus on reducing air voids and increasing density is crucial for effective asphalt pavement construction.