Why are larger drums on static rollers preferred over smaller drums?

The preference for larger drums on static rollers over smaller drums relates significantly to the dynamic interaction between the drum and the asphalt surface being compacted. Larger drums are less likely to create surface irregularities, such as waves, during the compaction process. This phenomenon occurs because the larger surface area of a big drum disperses the applied compactive forces over a greater area, promoting a more uniform compaction of the asphalt.

The ability of larger drums to mitigate the formation of waves is crucial for achieving a smooth and stable pavement surface. When smaller drums compact asphalt, they might exert concentrated pressure that can lead to uneven compaction, resulting in undesirable surface distortions like waves or ridges. In contrast, the broad coverage offered by larger drums contributes to a consistent finish and better overall quality of the pavement.

In summary, the use of larger drums minimizes the potential for wave formation during the compaction process, which is essential for ensuring a high-quality and durable asphalt surface.