Characterizing clay soils in Diwaniyah, Iraq, is important because differences in mineralogy, salt content, and chemical composition can significantly affect the swelling tendency, strength, compressibility, and overall performance of foundation and subgrade soils for pavements. In this context, this research focuses on the study of chemical properties of the local clay soils along with physical and mineralogical properties. 16 samples of clay soils were collected from four sites (S1-S4) within a depth range of 0-2.0 m. The laboratory tests that were conducted included particle size distribution, Atterberg limits, pH, electrical conductivity, sulfate, chloride, calcium carbonate, organic matter content, soluble salts,major oxides,mineralogical composition, compaction, unconfined compressive strength (UCS), cohesion, friction angle, California Bearing Ratio (CBR), free swell ratio, and compression index. Soil compositions revealed a mean clay percentage of 59.32% and plasticity index of 28.15%, implying moderate-to-highly plastic behavior of soils. Mean pH and conductivity were 7.86 and 6.10 dS/m, respectively, but the high concentration of soluble salts varied chemically. The dominant mineral was quartz at 27.75%, and montmorillonite averaged 18.50%. Results from engineering tests showed a mean value of 179.50 kPa UCS, 5.60% CBR, 43.25% free swell, and 0.32 compression index. Soil composition S3 performed best in terms of engineering performance while S2 exhibited higher salinity and swelling potential along with inferior strength properties. From the above discussion, it is clear that soil chemistry and mineralogy are interrelated with engineering properties of soils, which could be applied in foundation design, paving construction, drainage, and stabilization of soils in Diwaniyah.
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