A fi ne$-$grained soil has $60\%$ clay with LL $5220\%,$ PL $5$

$45\%,$ and a natural water content of $6\%.$ A standard

Proctor test was carried out in the laboratory and the

following data were recorded.

Diameter of mold $101\mathrm{.}40$ mm

Height of mold $116\mathrm{.}70$ mm

Mass of mold $4196\mathrm{.}50$ grams

Specifi c gravity, Gs $2\mathrm{.}69$

Unit weight Water content

determination determination

Mass of Mass of

can and can and Mass

Mass of wet soil wet soil dry soil of can

and mold $($grams$)($grams$)($grams$)($grams$)$

$6257105\mathrm{.}05103\mathrm{.}1042\mathrm{.}10$

$6356100\mathrm{.}6997\mathrm{.}9040\mathrm{.}90$

$6400114\mathrm{.}71110\mathrm{.}7042\mathrm{.}70$

$6421134\mathrm{.}26128\mathrm{.}5042\mathrm{.}50$

$6400109\mathrm{.}34104\mathrm{.}8041\mathrm{.}80$

$($a$)$ Determine the maximum dry unit weight and opti

mum water content.

$($b$)$ If the desired compaction in the fi eld is $95\%$ of the

standard Proctor test results, what values of dry

unit weight and water content would you specify?

Explain why you select these values.

$($c$)$ What fi eld equipment would you specify to com

pact the soil in the fi eld, and why?

$($d$)$ How would you check that the specifi ed dry unit

weight and water content are achieved in the fi eld?