What aspect of aggregate influences the ability to achieve desired compaction?

The angularity of aggregate plays a significant role in achieving desired compaction in asphalt paving. When aggregates are angular, they have more interlocking edges, which enhances their ability to lock together when compacted. This interlocking property allows for a tighter arrangement of the aggregate particles, leading to greater stability and higher density in the compacted asphalt mix.

Moreover, angular aggregates typically have a larger surface area compared to rounded aggregates, which can improve the bonding with the asphalt binder and contribute to overall compaction effectiveness. Essentially, the shape and texture of the aggregates significantly affect how well they can be compacted under pressure.

While coatings, moisture content, and color can influence other aspects of asphalt paving, they do not directly impact the physical interlocking and arrangement of aggregate particles as angularity does. For example, coating thickness might affect the bond between the binder and the aggregate, but it does not inherently influence the compaction dynamics. Similarly, moisture content is important for achieving optimal performance but is more related to preventing segregation and ensuring proper workability rather than the inherent interlocking capability of the aggregates. Thus, the angularity of aggregate is key to achieving the desired compaction in asphalt paving.