ii$.)$ What is the rationale for the choice of coarse aggregate in the ACI method? $[$Hint: Describe why the dry rodded unit weight of the coarse aggregate given in Table $9-5$ changes as a function of fineness modulus of the fine aggregate.$]$

c$)$ Assume that we will use the mix in a mild climate and we want $5000$ psi strength. In addition, assume the slump will be $6$ inches, and the maximum size coarse aggregate will be $1$ inch. ${?}_{(}).$ Fill in the information in Table II below for a non$-$air$-$entrained concrete mix.

Table II$.$ Concrete Mix Proportions $-$ Initial Values

$\backslash$table$[[$Mix Information,Units,Calculations,Mix$],[$Water$/$cu yd concrete,$lb,$Same as Part a$.)($i$),],[$Air$,$ estimated,vol $\%,,],[$Water$-$cement ratio,wt $\%,,],[$Cement$/$cu yd concrete,lb$,,],[$Vol;$/$ CA$/$cu yd concrete,cu ft$,$Same as Part b$.)($i$.),],[$CAlcu yd concrete,lb$,,]]$

d$)$ The next step in the ACI method requires finding the amount of fine aggregate $($FA$)$ by the absolute volume method. Fill in the information in Table III below.

Table III. Concrete Mix Proportions $-$ Finding the volume of FA

$(f{t}^3)$

$\backslash$table$[[$Vol cement $($per cu yd$),$cu ft$,,],[$Vol water $($per cu yd$),$cu ft$,,],[$Vol CA $($per cu yd$),$cu ft$,,],[$Vol air $($per cu yd$),$cu ft$,,],[$Total $($per cu yd$),$cu ft$,,],[$Vol FA $($per cu yd$),$cu ft$,,]]$

$($Problem is continued on next page...$)$