<p>Various factors, including technical aspects, project terms, economic conditions, and environmental issues, play a crucial role in soil stabilization. Soil improvement through the use of stabilizing materials, such as lime and cement, has recently gained widespread favor due to its cost-effectiveness and abundant availability; however, the use of such materials can lead to environmental problems caused by greenhouse gas emissions. This highlights the need to use ecologically sound and economically convenient materials in soil stabilization. Trass is a natural, eco-compatible pozzolan capable of improving soil’s mechanical properties due to its high aluminum and silica content. The current study examines how trass affects the stabilization of sandy soil, focusing on the type and molarity of the alkaline activator, as well as curing time and conditions, using the unconfined compressive strength (UCS) test. Results indicate that the compressive strength of the untreated sandy soil samples can be increased from 0&#xa0;MPa to 5.35&#xa0;MPa and 6.81&#xa0;MPa under wet and dry curing conditions, respectively. In addition, alkaline sodium silicate (Na₂SiO₃) solution indicated a higher UCS in all similar samples than those containing alkaline sodium hydroxide (NaOH) solution. Furthermore, it is revealed that trass treatment is more efficient at dry curing conditions, while cement stabilization is superb at wet conditions. This difference can be attributed to the role of water and pH in the kinetics of geopolymerization and cement hydration.</p>