
This study investigates the effects of Cement, gypsum and recycling concrete on compaction properties of the clayey soil. Inorganic clay with low Plasticity was used in this study as a natural soil. For this purpose a series of laboratory experiments have been implemented and varieties of samples were made by mixing cement, gypsum and recycling concrete with natural soil. Three different percentages of cement (3%, 6% and9%), three different percentages of gypsum and recycling concrete (3%, 6% and 9%) were used as stabilization materials. The results demonstrated that adding cement has a significant effect on increasing the degree of compaction of the soil. In general, the results show that the performance of cement-stabilized soils was superior to gypsum in all the characterizations performed.