Tadesse(PhD), SamuelKedir, Abas2018-06-082023-11-112018-06-082023-11-112011-04http://etd.aau.edu.et/handle/12345678/247In road construction, earth roads become muddy and slippery during wet season and cause dust problem during dry season. At the time of road construction obtaining good road construction material is becoming scarcer and as much as possible use in-situ material. One of the in-situ materials is laterite soils. The objective of this research work was to study the usefulness of Con-Aid as a stabilizer for laterite soil. Sampled from Gidole town (South Ethiopia) has been investigated. Four specimens were taken from two test pits at different depths from Gidole town (South Ethiopia).The geo-chemical characteristics have been investigated on soils sampled. Accordingly, the soils under considerations were laterites. Moisture contents determination using oven temperature of 105oC and oven temperature of 50oC with maximum relative humidity (RH) 30% were also carried out on the soil samples to investigate presence of loosely bound water of hydration. It was obtained that the soil samples did not contain loosely bound molecular water in a significant amount. Atterberg limits were investigated for testing procedure on the soil samples to see effect of test manipulation on concretionary bond. The liquid limit tests were carried out on soil specimens mixed for 5 minutes and 30 minutes durations. It was observed from the test results that the mixing durations has significant effect on the values of liquid limits. The Atterberg limits, compaction and soaked CBR tests carried out without and with Con-Aid chemical, to evaluate the change in the engineering properties of the stabilized soil after curing the treated samples for different periods. From the test results, were not seen a promising reduction of plasticity, increment of maximum dry density and improvement of the CBR value. These indicate that the Con-Aid effect does not exceed the natural effect of the laterite soil. Full reactions of Con-Aid could not take places, because the soil under investigation in Gidole town was naturally cementeous materialenGoetechnical ;lateritic soilThesis