What is the minimum specified density that all asphalt mixes should reach after compaction?

In the context of asphalt mix compaction, achieving a minimum specified density is crucial for ensuring the durability and performance of the asphalt pavement. The specified density indicates how well the asphalt has been compacted, which influences its stability, resistance to deformation, and overall lifespan.

The correct answer reflects that asphalt mixes should achieve a density of at least 92.0 percent of the maximum specific gravity after compaction. Achieving this level of compaction helps to minimize air voids within the asphalt, which can lead to moisture infiltration and potential damage over time. It also ensures that the mix is adequately dense to resist traffic loads and environmental impacts.

The other options present lower percentages, which, while they may be permissible in less stringent contexts or for specific types of mixes, do not meet the generally accepted standard for ensuring the structural integrity and longevity of typical asphalt mixes used in roadway construction. A density higher than 92.0 percent would be ideal, but this specific threshold is considered the minimum acceptable standard for most applications.