$2\mathrm{.}1.$ Discuss the difference between AASHTO and Unified Soil Classification

systems $($USCS$).(7)$

$2\mathrm{.}2.$ The results on Table $2$ were obtained from the classification tests on a soil

sample. Classify the samples according to the AASHTO and USCS. Hint: use

the information given in Annexures $2,3($a$)$ and $3($b$).$ Provide a detailed

classification to receive full marks $(8$ marks for AASHTO and $6$ marks for

the USCS$).(14)$

Table $2$: Sieve analysis and Atterberg limit

$[21$ marks$]$

Sieve size $($mm$)5028\mathrm{.}020145\mathrm{.}02\mathrm{.}00\mathrm{.}4250\mathrm{.}075$

Cumulative

Percent finer $(\%)10010099\mathrm{.}699\mathrm{.}697\mathrm{.}985\mathrm{.}755\mathrm{.}213\mathrm{.}6$

Liquid Limit $(\%)21\mathrm{.}1$

Plastic Limit $(\%)18\mathrm{.}1$