2.2 Methods
The collected soil sample was divided into five equal parts with the
same natural properties. Then, each part was mixed with 0%, 2.5%, 5%,
7.5% and 10% of hydrated lime, by the respective dry weight of the
soil sample and then the required moisture content was added. The
mixtures were stored in waterproof containers for 24 hours to allow for
homogeneity and mature. Particle size distribution and specific gravity
were determined for the untreated soil sample in the laboratory in
addition to the Atterberg limits, standard Proctor compaction and
unconfined compression tests. These laboratory tests were conducted on
the untreated soil and the treated soil samples, respectively.