2.2.2 Compaction tests
The method given in the ASTM D698 (2000) was applied to determine the maximum dry density (MDD) and the optimum moisture content (OMC) of the soil samples. The soil mixtures, with and without hydrated lime, were thoroughly mixed for one hour before performing compaction tests. De-ionized water was added to the soil mixture. The first series of compaction tests were aimed at determining the compaction properties of the untreated soil samples. The second serious of tests were carried out to determine the compaction properties of the treated soils with various amounts of hydrated lime.