An aggregate base is a dense-graded compacted aggregate that is typically positioned on a prepared subgrade.
Understanding Aggregate Base
Based on standard construction practices and the provided reference, an aggregate base serves as a crucial layer in pavement and construction projects.
- Definition: An aggregate base is defined as a dense-graded compacted aggregate. This means it consists of a mixture of different aggregate sizes blended together to achieve a dense, stable layer when compacted.
- Placement: This layer is normally placed on a prepared subgrade. The subgrade is the underlying soil or existing ground surface which must be properly prepared (e.g., compacted, graded) before the aggregate base is laid.
- Procedure: The placement of the aggregate base is typically performed in accordance with specific construction standards or sections, such as Section 105.03. These sections outline the requirements for materials, placement methods, and compaction.
- Material Requirements: Materials used for aggregate bases are required to meet specific sizing criteria, referred to as "size No." in the reference. (Note: The reference specifies "size No." without further detail).
In essence, the aggregate base provides a strong, stable, and uniform support layer between the subgrade and the upper pavement layers (like asphalt or concrete), distributing loads and preventing deformation.
