Expansive soil is a soil that has large changes in volume when there is a change in its water content, and it is found in many areas in Egyptian valleys. This research aims to study the effect of using locally low-cost materials such as crushed glass wastes and lime to improve the engineering properties of expansive soil. The expansive soil that has been studied is taken from Al-Kawamil city (New Sohag city); the Sohag region is considered unsuitable soil for civil engineering projects such as roads and buildings, as it was classified according to the AASHTO classification A-7-6.? The percentage of soft materials passing through sieve No. 200 (0.075 mm) was more than 90%. This soil was treated only with different ratios of crushed glass wastes (0%, 5%, 10%, 15%, and 20%) by the expansive soil weight, as well as the soil was treated only with different ratios of lime (0%, 2%, 4%, 6%, and 8%) by the expansive soil weight. Atterberg limits (liquid limit, plastic limit, and plasticity index), standard proctor test (optimum moisture content and maximum dry density), and swelling test were carried out. The results have shown an improvement in the engineering properties of the expansive soil, such as Atterberg limits and swelling pressure, by increasing added percentage of crushed glass waste and lime separately. This helps to make use of the local materials available at low cost, make the environment clean from glass wastes and recycle these wastes so they can be utilized at the environmental, economic, and engineering levels. This matches the sustainable development strategy of Egypt's vision 2030 in both the environmental and economic dimensions.
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