Problem Statement:

The Marshall procedure was used to design an asphalt concrete mixture for a heavy$-$traffic road. A PG $64-16$ asphalt cement with a specific gravity $(G_b)$ of $1\mathrm{.}025$ is to be used. The mixture contains a $19mm$ nominal maximum particle size aggregate, with bulk specific gravity of $2\mathrm{.}654.$ The theoretical maximum specific gravity of the mix is $2\mathrm{.}480$ at $4\mathrm{.}5\%$ asphalt content. Trial mixes were made, with the average results shown below. Determine the optimum asphalt content using the Asphalt Institute design criteria $($Tables attached$).$ Assume a design air void content of $4\%.$ Comment if the mix design meets all the specifications, if yes; why, if not; why not.

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