How many layers should a 40 cm thick Aggregate Base Course be placed in?

For a 40 cm thick Aggregate Base Course, the recommended practice is to place the material in multiple layers to ensure proper compaction and uniformity throughout the installation. Typically, each layer should be approximately 15 to 20 cm thick. By dividing the total thickness into multiple layers, it allows for better control over the compaction process, as each layer is more manageable and can be compacted more effectively.

Placing too much material in a single layer can lead to inadequate compaction, resulting in an unstable base that may not provide the necessary support for the structure it is meant to support. Therefore, for a total thickness of 40 cm, three layers of approximately 13 to 15 cm each is practical, offering a good balance between layer thickness and compaction efficiency.

This method also helps in achieving a uniform material distribution and enhances drainage characteristics within the base course, which is vital for the longevity and performance of the pavement or structure that will be constructed on top of it.