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.