When is it prohibited to place surface course material that will be the final layer of pavement?

The prohibition on placing surface course material, which serves as the final layer of pavement, between December 15 and March 16 is grounded in the need to ensure optimal conditions for achieving the desired quality and longevity of the pavement. During this period, weather conditions often include lower temperatures, which can negatively affect the temperature of the asphalt mix and its ability to bond properly with existing layers. Furthermore, cold conditions may lead to issues such as premature cracking or failure of the asphalt before it can adequately cure and achieve its design strength.

By restricting surface course application during these winter months, road construction practices align with best practices to promote durability and longevity in roadway surfaces. This helps maintain safety and performance standards for the final road surfaces. Other time constraints, such as weekends or night work, may be subject to other practical considerations but do not specifically relate to the physical properties required for proper asphalt placement and curing.