How does the moisture content affect the compaction of aggregate materials?

Moisture content plays a critical role in the compaction of aggregate materials by affecting both the workability and the efficiency of the compaction process. When aggregates are not at the optimal moisture level, the ability to achieve proper compaction can be hindered.

When moisture is added to aggregate materials, it creates a temporary film around the particles, which helps to lubricate them during the compaction process. This lubrication allows for better rearrangement of the particles into a denser formation, leading to improved compaction density. Conversely, if there is too little moisture, the particles can get stuck and fail to compact effectively. Conversely, excessive moisture can lead to a loss of cohesion, potentially causing a decrease in stability.

Thus, managing moisture content is essential for achieving maximum density and stability in aggregate materials, making it a key factor in construction projects. This understanding is crucial for ensuring that the aggregate base meets specified requirements for strength and durability.