Extensive researches has been carried out by different researchers to find solutions associatedrnwith problems of expansive soils .The construction industry has presented a number of groundrnimprovement techniques to modify expansive nature of soils and to minimize or eliminate therndanger of damage of structures because of heave and shrinkage. Soil-stabilization is one amongrndifferent ground improvement alternatives being used worldwide. Soil-stabilization is anyrntreatment applied to a soil to improve its strength and reduce vulnerability to heave. There are rndifferent methods of soil stabilization that have been identified to improve the expansive rnnature of soils. Due to the growing cost of these stabilizing agents and the need for therneconomical utilization of industrial and agricultural wastes, in modern days of industrialization itrnbecomes imperative to use waste materials from various industries for expansive soilrnstabilization. rnrnThis research work is aimed at exploring whether a waste from quarries i.e. quarry dust, can bernused as stabilizing material for expansive soils or not. The performance of quarry dust wasrnevaluated based on laboratory test results on expansive soil collected from Addis Ababa aroundrnBole area. The soil was initially characterized and classified based on index tests and found to bernA-7-5 according to AASHTO and CH according to USCS systems. Soils with this category havernvery low load bearing capacity and are highly expansive soils. The effects of quarry dust on thernengineering properties of the soil were evaluated by treating the soil with quarry dust passing No.rn200 sieve in stepped concentration of 2%, 4%, 6%, 8%, 10%, 20% and 30% by dry weight of thernsoil. All treated soil samples were cured for 7 days before the tests were conducted. Testrnspecimens were subjected to Atterberg limit, free swell, swelling pressure,UCS, compaction andrnCBR tests.rnrnThe analysis of results showed reduction in plasticity index, free swell, swelling pressure, OMCrnand UCS with all higher quarry dust contents and a slight increase in the maximum dry densityrnand soaked CBR values. Generally, it was concluded from the results that quarry dust is not anrneffective stabilizer for the improvement of most of the geotechnical properties of the soil, whilernswelling properties showed significant reduction to the level in which the uplift pressure ofrnexpansive soil can be controlled by the counter pressure of light weight structures.rnrnAdditional study has also been incorporated to investigate the effect of blending granular quarryrnwaste material (Passing No.4 and retaining No.200) with expansive soil, so that it can be used asrna mechanical stabilizer for expansive subgrade soil. Compaction and CBR tests were performedrnand the results showed a very slight improvement in both test values. From this study it wasrnfound out that soil mechanically stabilized with granular quarry waste do not meet the minimumrnrequirement of ERA pavement manual specification for use as a sub-grade material in roadrnconstruction, in the context of this study.