Dense Graded Aggregate (DGA)

Definition

Dense Graded Aggregate (DGA) is a product used in pipe trenches as a base to support final paving operations. It is generally made from crushed stone, gravel, reclaimed asphalt, or a mixture of these materials.

Purpose

The purpose of DGA is to provide a stable, compacted base layer for construction projects, particularly in pipe trenches and under paving. It ensures proper support and drainage, preventing settlement and maintaining the integrity of the paved surface above.

Examples of Use

1. Road Construction: Using DGA as a base layer beneath asphalt or concrete pavements to ensure stability and longevity of the roadway.
2. Pipe Trench Backfill: Filling pipe trenches with DGA to provide a firm foundation and protect the pipes from movement and damage.
3. Parking Lots: Creating a compacted base with DGA before laying the final asphalt or concrete surface in parking areas.

Related Terms

• Base Course: The layer of material laid on the subgrade, on which the pavement is placed.
• Subgrade: The natural or prepared soil surface that supports the base course and pavement.
• Aggregate: A broad category of coarse to medium-grained particulate material used in construction, including sand, gravel, crushed stone, and recycled concrete.

Notes

• DGA must be properly compacted to achieve the desired density and load-bearing capacity.
• The composition and gradation of DGA are important factors in its performance, influencing drainage, stability, and compaction.
• Regular testing and quality control are necessary to ensure that DGA meets the specifications for its intended use.