In light of global trends toward achieving sustainable development and enhancing the efficient use of natural resources, geotechnical engineering stands out as one of the important engineering disciplines in developing infrastructure and improving the performance of structures. The treatment of weak soil is particularly important because of its direct impact on the stability of foundations, the durability of roads, and the safety of engineering structures. With growing interest in environmentally friendly engineering solutions, recent research has turned to studying the possibility of using agricultural and industrial waste and recycled construction materials to improve the engineering properties of soil, thereby helping to reduce waste, rationalize resource consumption, and explore more sustainable economic alternatives in infrastructure projects. Engineering projects in many regions face challenges associated with soils whose geotechnical properties are unsuitable for foundation construction, such as low shear strength, high compressibility, the possibility of differential settlement, as well as swelling and shrinkage in some types of clayey soils. These conditions require careful geotechnical investigations and an assessment of the soil’s physical and mechanical properties, in order to select the treatment appropriate to the nature of the site and the requirements of the project. This helps to enhance the stability of structures, reduce engineering risks, and improve the performance of infrastructure in the long term. The use of alternative materials in soil stabilization is one of the promising research trends in geotechnical engineering, as it makes it possible to benefit from certain agricultural and industrial wastes and convert them into materials of engineering value. The effectiveness of these materials depends on their chemical composition, physical properties, addition rates, soil type, and treatment conditions. A prominent example is rice husk ash, which may contain high proportions of silica and can possess pozzolanic properties when the appropriate chemical composition and production conditions are available. When used with lime or other binding materials, it can help improve some of the engineering properties of the soil, including strength and plasticity, depending on the soil type, mixing proportions, and treatment conditions. The importance of this material lies in the possibility of using agricultural waste in useful engineering applications, rather than disposing of it in ways that may lead to undesirable environmental effects. Quicklime and hydrated lime are used to treat certain types of clayey soils, as they help modify their plastic properties and improve their workability, and the long-term chemical reactions between lime and the reactive components of the soil can contribute to the formation of compounds that enhance its strength and stability. The efficiency of the treatment depends on the type of lime, the properties of the soil, the addition rate, and the treatment conditions. It is possible to study combining lime with suitable secondary materials, such as rice husk ash, to develop stabilization systems that benefit from the reactive properties of these materials and reduce reliance on some conventional materials. Crushed brick powder resulting from construction and demolition waste can also be studied as a potential additive for improving soil properties, particularly where mineral components suitable for pozzolanic reactions are present. The use of such waste offers an opportunity to recycle part of construction waste and employ it in engineering applications, with the need to evaluate its chemical and physical properties, its fineness, and the extent of its effect on the soil’s strength, compressibility, and stability. As for fly ash produced by certain industrial processes, it can be used in soil stabilization applications according to its chemical composition, its properties, and its suitability for the proposed use, and it may be used on its own in some applications or in combination with lime to improve soil performance. However, its use requires a careful environmental assessment to verify its content of elements that may affect the soil and groundwater, as well as to ensure its compliance with approved environmental and engineering requirements and standards. Concrete and brick waste resulting from demolition and construction operations offers opportunities for reuse in certain geotechnical applications, such as road layers and backfill works, after treatment and verification of grain-size distribution, strength, durability, and environmental properties. This approach supports the concept of the circular economy, which is based on reducing waste and reintroducing usable materials into the production cycle, helping to rationalize the consumption of natural resources and enhance the efficiency of construction waste management. The mechanism by which soil is improved depends on the nature of the added material and the properties of the target soil. In some systems, the reaction between lime and reactive silica and alumina, when suitable conditions are available, leads to the formation of pozzolanic compounds that contribute to increased cohesion and strength over time. In other systems, the improvement may result from modifying the grain-size distribution, reducing plasticity, or improving particle arrangement and reducing voids. Therefore, it cannot be assumed that all recycled materials work through the same mechanism or achieve the same results in different soil types. Determining the best treatment method requires appropriate laboratory tests, including Atterberg limits, shear strength, compressibility and swelling properties, density and moisture content, as well as an assessment of long-term durability and stability according to the nature of the engineering application. The importance of using alternative materials is not limited to improving the engineering performance of the soil, but extends to the possibility of reducing the quantities of waste sent to landfill, lowering the demand for certain raw materials, and making use of available local resources. These solutions may help reduce the cost and environmental impact of some projects, but achieving this requires an integrated study that includes the cost of collecting, processing, and transporting waste, the energy used in preparing it, the efficiency of the resulting material, and the maintenance and performance requirements throughout the life of the structure. Hence the importance of assessing the life cycle of materials, rather than merely comparing their initial prices, to ensure that the choice of a sustainable material is based on clear scientific, engineering, and economic foundations. Scientific research is the foundation for developing soil stabilization techniques and verifying their suitability for practical application. Laboratory experiments make it possible to study the effect of the type of additive, its proportion, and the duration of treatment on the engineering properties of the soil, which helps determine the appropriate mixtures for each case. Linking laboratory results with engineering analysis and field conditions also contributes to moving from the stage of research experiments to reliable practical applications, while taking into account safety, durability, and engineering and environmental standards. These studies are particularly important in Iraq, where studying the properties of local soil and available materials can contribute to developing solutions suited to the conditions of construction projects and development needs, with the need to verify the efficiency of each treatment before adopting it in the field. Interest in modern research topics in civil engineering and geotechnics at Al-Mustaqbal University represents an opportunity to enhance scientific knowledge and develop the skills of students and researchers in analyzing engineering problems and exploring innovative solutions. Combining theoretical foundations, laboratory experiments, and practical applications helps prepare engineers capable of applying scientific knowledge to address real-world challenges and developing ideas that take sustainability and efficient resource use into account. Encouraging research on alternative materials and waste recycling also opens broader horizons for integration between engineering disciplines and environmental and economic concerns, and supports the move toward more efficient solutions in infrastructure projects. In conclusion, the use of secondary agricultural and industrial materials and construction waste in soil stabilization represents a promising field for research and innovation in geotechnical engineering, as it combines the effort to improve soil properties, the utilization of waste, and the exploration of alternatives that may be lower in cost and environmental impact in specific applications. The success of these solutions remains contingent on rigorous scientific evaluation, verification of engineering and environmental performance, and consideration of safety, durability, and cost requirements throughout the life of the project. By strengthening scientific research and developing engineering competencies, the horizons of innovation in soil treatment can be expanded, contributing to the building of more efficient and sustainable infrastructure and supporting the course of development and scientific progress in Iraq.