Subbases
Subbases are layers of material placed on top of the subgrade but beneath the base course in road construction. They serve as a foundation for the base course and provide additional support and stability to the pavement structure. Subbases are typically made of aggregate materials such as gravel or crushed stone, and their thickness and composition can vary depending on the specific requirements of the project. Properly designed and constructed subbases are essential for ensuring the long-term durability and performance of the pavement.