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ABSTRACT
Black cotton soils are a type of expansive soil that are basically susceptible to volumetric changes with changes in moisture due to the presence of the montmorillonite, which has an expansive lattice. Black cotton soils are very weak and do not have enou gh stability for any type of construction work such as in foundations of new and existing structures. This study was to evaluate the engineering properties of Black Cotton Soil (BSC) stabilized with mixtures of Lime and Iron Ore Tailings. Black cotton soil samples were obtained from Numan, in Yola, Adamawa State. The natural soil was subjected to detailed laboratory tests. The tests conducted were specific gravity test (Gs), particle size analysis, consistency tests, compaction tests, California Bearing Ratio (CBR) and Unconfined compressive strength (UCS). The soil was later mixed with different percentages (0, 2, 4, 6, 8 and 10 %) of lime and iron ore tailings at proportions of 40% and 60% by weight respectively. To assess the reliability of the laboratory test results and establish the influence of stabilization on the soil properties, statistical analysis using the Cronbach alpha reliability index and descriptive statistics based on the variation between the mean and standard deviation was done. To determine the data quality and diagnose its statistical properties, selected statistical techniques, namely; box plot, variance inflation factor (VIF) and heteroscedasticity were employed. Thereafter, least square regression analysis was done to determine the relationship between the selected geotechnical properties and the level of stabilization.
