Q$1.$

a$)$ Discuss any two $(2)$ factors affecting compaction of soils. Include any relevant sketches.

Ylinax $Mny$ marks

b$)$ Recommend possible preventive measures for controlling quality of field compaction.

$(3$ marks$)$

c$)$ Figure $1$Qc shows a compaction curve and air void lines with respects to degree of saturation $($Sr$)$ of $100\%,90\%$ and $80\%.$ Based on the figure, define the maximum dry unit weight and optimum moisture content. Using the equation given, analyze the dry unit weight at moisture content of $20\%$ based on $20\%$ air void content $($Av$).$

Given Gs $=2\mathrm{.}7$ and assume ${}_w=9\mathrm{.}81k\frac{N}{m^3}$

$\mathrm{.}81k\frac{N}{m^3}=\frac{Gsw}{1+(\frac{Gsw}{S})},{}_d=\frac{G_s{}_0}{1+C_s}(1-Av)$

$d=\frac{WG}{e}$

Figure Q$1($c$)$

$(8$ marks$)$

$(15$ marks$)$