Why is it important for asphalt to be cooled slowly after compaction?

Cooling asphalt slowly after compaction is essential primarily because it helps to prevent cracking and reduces thermal stresses. When asphalt is laid down and compacted, it is in a hot, pliable state. If it cools too quickly, it can undergo significant temperature differentials, leading to the formation of cracks due to the internal stresses generated by contracting materials. These stresses can weaken the pavement structure and compromise its longevity and durability. By allowing a gradual cooling process, the risk of these detrimental effects is minimized, ensuring a more stable and resilient asphalt surface. This approach helps maintain the integrity of the pavement and extends its service life, making it crucial for achieving a high-quality asphalt installation.