this assignment requires a study in construction engineering for a U$.$S curriculum.

$1\mathrm{.}7$ Figure $1$ shows an approximate relationship of concrete

compressive strength and water$-$cement ratio.

a$.$ What is the expected range, that is$,$ both minimum and maximum, of

concrete compressive strength corresponding to $0\mathrm{.}6\frac{W}{C}$ and that

corresponding to $0\mathrm{.}4$ WiC?

b$.$ What is the maximum water$-$cement ratio for $5,000$ psi compressive

strength concrete?

$1\mathrm{.}8$ An engineer has specified $7,000$ psi concrete compressive strength. The project's concrete supplier has proposed a

concrete mix design that includes $5$ gallons of water per sack of cement. Refer to concrete strength relationship in Figure $1$

and determine if the proposed concrete mix design is acceptable. If it is not acceptable, how it should be revised to meet the

required strength.