Develop a concrete mixture proportion that has a $28$ day compressive strength of $4000$ psi, and a

slump of $4$ inches. The concrete will be used for an indoor, elevated concrete slab. The materials

used in the mixtures and their properties are shown below in Table $1.$ Do not correct for aggregate

moisture. The mixture proportion should be in $$lbs$/$yd$^3.$

Table $1.$ Material Properties.

Cement

Type I

Specific gravity $=3\mathrm{.}15$

Coarse Aggregate

MSA $=1\mathrm{.}0$ in$,$

NMSA $=0\mathrm{.}75$

Specific gravity $=2\mathrm{.}68$

Absorption capacity $=0\mathrm{.}71\%$

D$.$R$.$U$.$W$.=100$ lb$/$ft$^3$

Moisture content $=1\%$

Fine Aggregate

F$.$M$.=2\mathrm{.}99$

Specific gravity $=2\mathrm{.}63$

Absorption capacity $=0\mathrm{.}86\%$

Moisture content $=4\%$