What does a bulk specific gravity test measure in a compacted asphalt specimen?

The bulk specific gravity test measures the overall density of a compacted asphalt specimen by determining its mass per unit volume, including both the solid particles of the asphalt mixture and the voids within it. This test is critical in assessing the material's quality and performance characteristics.

By calculating the bulk specific gravity, inspectors can evaluate how the asphalt behaves under loading and its potential durability under various environmental conditions. It also serves as a basis for other calculations, such as void content and air voids in the mixture, which are essential for ensuring the asphalt performs as intended.

Understanding the overall density is important for achieving the desired balance of strength, flexibility, and durability in the pavement. The information gained from this test helps field personnel ensure that the asphalt mix meets the specifications required for performance and longevity in road construction.