When taking readings on pavement, the _______ density is used:

The concept of density readings in pavement quality, particularly in the context of asphalt, generally refers to the measurement of the material's compactness. The correct choice highlights that the wet density is used during the initial testing phase after the asphalt is compacted but before it has completely cooled and cured.

Wet density accounts for both the mass of the asphalt mixture and the moisture content. This is particularly relevant because moisture can significantly affect the weight and performance characteristics of the asphalt. Inspectors and engineers need to consider wet density measurements to ensure adequate compaction and performance standards for the pavement.

Using wet density readings can help identify issues such as over-compaction or insufficient moisture content in the mixture, which would affect the overall strength and durability of the pavement. Therefore, in the context of actual field testing for HMA, relying on wet density provides a more accurate representation of the mixture's behavior immediately after laying down the asphalt.