What is the required core compaction percentage according to ASTM specifications?

The correct answer is based on the established standards set forth by ASTM specifications, which recommend achieving a core compaction percentage of 96% of the Marshall density. This percentage is critical in ensuring that the asphalt mixture is adequately compacted, thereby enhancing its durability and resistance to deformation and moisture infiltration.

Achieving this level of density is essential for the performance of asphalt pavements under traffic loads, as it contributes to the overall structural integrity and longevity of the surface. A proper compaction technique also reduces the risk of voids within the asphalt mix, which can lead to potential issues such as water damage and premature failure.

In summary, the requirement for 96% of Marshall density reflects the industry's emphasis on achieving optimal performance characteristics for asphalt pavements, aligning with best practices in construction and material standards.