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Mineralogical and geotechnical properties used to analyse the swelling potentials of Al-Hartha City. According to mineralogy, montmorillonite is a dominated clay mineral (33.61%) followed by montmorillonite-chlorite (33.34%), kaolinite (9.18%) and illite (5.38%). While calcite, Quartz, Feldspar, and dolomite are non-clay minerals that are also present. According to geotechnical analysis, the percent of clay range between 9-42% with an average of 25.5%, silt 55-80% with an average of 67.5% and sand 0-17% with an average of 8.5%. While liquid limits and plasticity index are, respectively, 10–25% with an average of 17.5% and 35%–51% with an average of 43%. According to the unified soil classification system (USCS), these soils are mainly low plasticity lean clay soils (CL) and 10% classified as medium stiff elastic silt (MH). According to activity values, soils are primarily inactive-(70%), normally active-(20%), active-(10%), and their consistency is plastic. according to an assessment of soil expansivity based on index properties and activity, a significant amount of the soil is expansive. Additionally, there is an agreement between the results of the mineralogical tests performed on these soils and the results of the measures of soil expansivity obtained from the evaluation of the swelling of the soil based on assessments of its index properties. [ABSTRACT FROM AUTHOR]

Expansive soils have the ability to swell and shrink with the variation in moisture content. Soil stabilisation is the process to improve the geotechnical properties of soils. The massive quantities of waste materials are resulting from modern industry methods create disposal hazards in addition to environmental problems. This study is carried out to evaluate the effect of steel slag (SS) as a by-product to improve the geotechnical properties of low-plasticity clay. A series of laboratory tests were conducted on natural and stabilised soils. SS was added by 0%, 2.5%, 5%, 10%, 15% and 20% to the soil. The conducted tests are consistency limits, specific gravity, hydrometer analysis, modified Proctor compaction, swelling pressure, swelling percent, unconfined compressive strength and California Bearing Ratio (soaked CBR). The results showed that the soil liquid limit, plasticity index, OMC, swelling pressure, and swelling percent were decreased when stabilised by steel slag. While the soil MDD, UCS and CBR were increased due to various percentages of steel slag. The steel slag was found to be successfully improving the geotechnical properties of expansive soils. [ABSTRACT FROM AUTHOR]

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