What must happen to plant mix base coarse or intermediate course if it will not be covered with surface course?

Plant mix base course or intermediate course plays a crucial role in roadway construction, providing essential support for the surface course. If these layers are not covered with a surface course promptly, they can be exposed to environmental factors that may degrade their performance.

In colder months, particularly in January or February, there are specific guidelines regarding the handling of these materials to ensure the integrity of roadway construction. The stipulation that it must be placed within 15 days if laid down during these months ensures that the material does not remain unprotected for an extended period. This timeframe allows for construction schedules to be maintained while minimizing the risk of damage due to weather conditions, thereby preserving the quality and stability of the roadway.

Thus, adhering to this guideline provides a practical solution that balancing the need for timely construction with the protection of the materials used, which is critical for the longevity and reliability of the roadway.