NICET - Highway Construction Inspection Practice Exam

What aspect of dense graded base contributes to its effectiveness?

1. It maximizes void space between aggregate particles

2. It minimizes voids when compacted

3. It uses large particles exclusively for strength

4. It is entirely composed of natural aggregates

The correct answer is: It minimizes voids when compacted

The effectiveness of dense graded base materials is primarily attributed to their ability to minimize voids when compacted. This characteristic is essential for achieving a solid and stable base layer that can support heavy loads and resist deformation under traffic. When aggregate particles are compacted, the arrangement allows for less air space or voids between them, leading to a denser structure. This density contributes to the material's strength and durability, making it ideal for use in highway construction and other applications where load-bearing capacity is critical. In a dense graded base, the mix of aggregate sizes plays a significant role in reducing voids and achieving a high degree of compaction. Smaller particles fill in the gaps between larger stones, leading to a more stable and robust structure. This property ensures that the base can adequately distribute loads, resist water infiltration, and maintain integrity over time, thereby enhancing the performance of the roadway.