This document discusses mechanical and chemical soil stabilization. It defines soil stabilization as treating soil to maintain, alter, or improve its performance for road construction. The purposes of soil stabilization include improving strength, reducing costs, making use of local soils, and improving undesirable properties. There are two main components: the soil and stabilizing agents like cement and lime. The stabilization process involves evaluating soil properties, choosing a method, and designing soil mixes. Mechanical stabilization increases stability through blending and compacting soils. Chemical stabilization relies on chemical reactions between stabilizers and soil minerals. Common techniques include soil-lime, soil-cement, and chloride stabilization. The advantages of soil stabilization are improving strength, reducing foundation costs, increasing stability, preventing erosion,