What does "DGA" stand for in asphalt mix design?

"DGA" in asphalt mix design stands for Dense Graded Aggregate. This term refers to a specific type of aggregate that has a particle size distribution that allows for minimal voids between individual particles when compacted. The dense grading contributes to a higher stability and durability of the asphalt mix, which is crucial for pavement performance.

Using a dense graded aggregate in an asphalt mix ensures that the resulting surface is less permeable, offering better resistance to water infiltration and consequently reducing the risk of damage from freeze-thaw cycles and other environmental factors. Properly designed DGA mixes lead to improved load-bearing capabilities, making them suitable for roadways subjected to heavy traffic.

The other options do not accurately describe the acronym DGA in the context of asphalt mix design, which emphasizes the importance of understanding terminology in asphalt materials to ensure effective communication and proper practice in paving projects.