What is the minimum interruption time for paving operations to warrant a transverse joint?

The minimum interruption time for paving operations that warrants a transverse joint is 15 minutes. This standard is important in paving work because, after a certain period of time without activity, the temperature and compaction of the asphalt can change significantly, potentially leading to poor joint quality.

If paving operations pause for longer than 15 minutes, there is a risk that the existing material's surface could cool and harden, which makes it difficult to achieve a good bond with the new asphalt that will be placed afterward. Therefore, to maintain proper pavement integrity and ensure a strong joint between sections, a transverse joint must be constructed. This joint acts as a control point for potential disturbances in the pavement integrity due to the interruption.

Options suggesting shorter times, such as 10 minutes, 5 minutes, or any duration less than 15 minutes, do not account for the necessary cooling and bonding requirements essential for high-quality paving work. Thus, adhering to the 15-minute guideline helps in achieving optimal results in paving operations.