Question $4$

$[4$ marks$]$

The compaction curve shown in the figure below was obtained from a modified Proctor compaction test.

Determine:

a$)$ What is the maximum dry density attained by the soil during this compaction test?

$[1]$

b$)$ What is the optimum water content?

$[1]$

c$)$ If a contractor is expected to compact this soil to a relative compaction of $RC=95\%,$ what is the minimum dry density that the contractor can achieve?

$[1]$

d$)$ What is the dry density that this soil would attain if it were compacted at $w=12\%$ and if we could remove all the air from the voids during compaction? Note: You may estimate your answer from the figure.

$[1]$