Example $2$

Crushed limestone aggregate contains $10\%$ filler material $($particles finer than $75)$ and $50$ ; of the aggregate particles are coarser than $2mm,$ both percentages by mass. This aggregate $)=(2\mathrm{.}73\frac{kg}{d}{m}^3$ is mixed with a cutback asphalt $)=(1\mathrm{.}15\frac{kg}{d}{m}^3$ at a proportion determined by McKessonFrickstead formula to produce bituminous concrete for highway pavement construction. The unit weight of the specimen cut from the compacted pavement was measured as $2\mathrm{.}40k\frac{g}{d}{m}^3.$ Estimate the void content of this bituminous concrete.