Asphalt Plant Technician Practice Test

When you have a fixed mold area, the volume of a specimen is proportional to its height. The mass needed to fill that volume depends on how dense the material is, which is expressed by the relative density. Since relative density is the ratio of the actual bulk density to the maximum theoretical density, mass scales with both height and relative density. The relationship can be written as m = Rd × ρmax × A × h. If you know the mass, height, and Rd from one specimen, you can compute the constant K = m/(h × Rd) = ρmax × A. For any new target height and target Rd, the required mass is m' = K × h' × Rd', or m' = m × (h' × Rd') / (h × Rd). This means you can derive a target mass for any desired height and relative density, provided you keep the mold and material properties the same. For example, starting from a specimen with mass m, height h, and Rd, you can predict the needed mass for a new height and Rd using the simple ratio m' = m × (h' × Rd') / (h × Rd).