Lateritic soils are highly weathered and altered residual soils formed by the in-situ weatheringrnAnd decomposition of rocks in the tropical and sub-tropical regions with hot, humid climaticrnConditions. Their formation also consists of leaching out of free silica and bases andrnAccumulation of oxides of iron, aluminum or both. This process is called laterization. LateritesrnAre rich in sesquioxides (iron oxides, aluminum oxides or both) and low silicates but mayrnContain appreciable amounts of kaolinite. Due to the presence of iron oxides lateritic soils arernRed in colour.rnLaterites are grouped under group of soils with a strong mineralogical influence derived fromrnClay minerals only found in residual soils. Soil engineering properties under this group arernHighly influenced by the presence of sesquioxides. Sesquioxides appear to act as cementingrnAgents which bind the other mineral constituents into clusters or aggregations. With sufficientrnConcretion of sesquioxides, the hard concretionary materials are formed. This concretionaryrnBond is broken down during test manipulation for some lateritic soils.rnIn this thesis work, some peculiar geotechnical and geo-chemical characteristics have beenrnInvestigated on soils sampled from Nejo- Mendi road construction area. Accordingly, the soilrnSamples under investigation have been obtained to be true laterites, in short referred to asrnLaterites. Moisture content determination using oven temperature of l05Â°C and ovenrnTemperature of 50Â°C with maximum relative humidity 30% were also carried out on the soilrnSamples to investigate presence of loosely bound water of hydration. It was obtained that thernSoil samples did not contain loosely bound molecular water in a significant amount.rnThe soil specimens were tested at different sample preparation conditions prior to testing. ThernEngineering properties investigated in the course of the research work include index tests,rnCompaction and California Bearing Ration (CBR) tests at oven temperature of l05Â°C dried, airrnDried (oven temperature of 50Â°C with maximum relative humidity 30%) and as receivedrnConditions on the soil samples. Accordingly, pre-treatment variation has not significantlyrnChange index, compaction and CBR test results.rnViii Atterberg limits were investigated for different testing procedures on the soil samples to seernEffect of test manipulation on concretionary bond. The liquid limit tests were carried out onrnSoil specimens mixed for 5 minutes and 30 minutes durations. It was observed from the testrnResults that the mixing durations has significant effect on the values of liquid limits.rnAccordingly, the soil samples have been sensitive to te