What does checking under the roller indicate when small transverse cracks are observed?

When small transverse cracks are observed in the pavement and an inspection under the roller is conducted, it indicates that there may be damage due to insufficient compaction. This occurs because inadequate compaction during the asphalt laying process can lead to weak areas within the pavement structure. These weak spots are unable to properly support the load placed upon them, resulting in stress concentrations that can manifest as transverse cracks.

Checking under the roller helps assess whether the compaction process has been effective. If cracks are present, it often means that some sections have not been compacted enough to resist the stresses from traffic loads, temperature fluctuations, or other external factors. This assessment is critical to ensure the longevity and durability of the pavement, as insufficiently compacted areas are prone to further deterioration over time.

In the context of pavement evaluation, recognizing the relationship between compaction and crack formation is vital for maintaining pavement integrity and addressing any potential issues before they escalate.