keywords: Soil indices, structural systems, stabilization, quarry dust, strength
Proper design of engineering structural framework begins from improving the characteristic of soils. This is due to undesirable behaviour of subgrade soils such as dispersion, swelling, shrinking and high level of settlement. Several strategies such as mechanical and chemical additives are considered to be an effective technique for soil improvement. An industrial waste is prescribed to improve the mechanical strength property and compressibility of engineering structural framework when subjected to heavy loads with little or zero cost. Disturbed and undisturbed soils (A1, A2, B1, B2, S1 and S2) were acquired using digger, shovel and core cutter, respectively. Disturbed samples were subjected to classification tests such as grain size distribution and consistency limits while California Bearing Ratio and Unconfined Compressive Strength. These soils were examined and interpreted with Landsat Image. The results (A1, A2, B1, B2, S1) show good to excellent materials, low plasticity and swelling potential , high maximum dry density , low moisture content and high compressive strength while structural deformation indicating good engineering and geological properties of subgrade soils utilized for construction purposes. S2 results shows high amount of fines, show fair materials, high plasticity, display critical expansive properties, low maximum dry density, high optimum moisture and low compressive strength than the minimum acceptable values of 103 kN/m2. It was inferred from 0 to 25% percentage addition of quarry dust stabilizer that plasticity index, liquid limit, OMC and plastic limit decreases with increasing in quarry dust while UCS and MDD is increasing with an increase in percentage of Quarry Dust. There is an increase in mechanical strength with percentage addition of industrial waste; thuss serving as suitable alternatives to modify and stabilize structural deformations.