What is considered successful compaction in asphalt mixes?

Successful compaction in asphalt mixes is defined by the finished mat reaching the minimum specified density. This criterion ensures that the asphalt has proper strength, stability, and durability for the intended traffic load and environmental conditions. Achieving the specified density means that the voids in the asphalt are minimized, which helps increase the lifespan of the pavement and its resistance to moisture infiltration, deformation, and cracking.

While a smooth surface and the absence of air pockets are desirable characteristics of a well-constructed pavement, they do not directly correlate with the key measure of density necessary for long-term performance and integrity. Similarly, achieving the maximum height may not necessarily reflect the necessary compaction density, as the thickness must also comply with engineering specifications that relate to the material's performance and design requirements. Therefore, focusing on reaching the minimum specified density of the finished mat directly aligns with the goals of effective asphalt compaction.