Stabilization of Deltaic Marine Clay (Chikoko Soil) using Blend of Quarry Dust and Lime
Keywords:
Chikoko Soil, Bearing capacity, Settlement, Shear strength, Stabilization.Abstract
This research work was designed to evaluate the suitability of quarry dust and lime for stress-strain strength development characteristics of Chikoko soil. The laboratory works involved preliminary investigations to identify the index properties of the soil samples at various boreholes. Results revealed that the soil belonged to the A-7-6 class of soil in the American Association of State Highway and Transportation (AASHTO) classification system. The soil samples from two different boreholes were stabilized with concentration of 0% to 15% quarry dust and lime. Results showed that the soil sample from (Borehole 1) with quarry dust and lime stabilization increased with the highest Maximum dry density of 2400kg/m3 at 5/10% also with an increased optimum moisture content of 13.8kg/m3 for bore hole 1 at 0 to 3/5% quarry and lime percentages. It was also observed that the cohesion and friction angle of 18KN/m2 and 16.0◦ (Borehole 2) were the highest values at 7/15% of quarry dust and lime. The normal stresses, deviator stresses and shear stresses increased at an optimum value of 125kN/m2, 241kN/m2 and 159kN/m2 at 5/10% quarry dust and lime for the different boreholes. The 5% quarry dust and 10% lime mixture appear to be the Optimum stabilization level, providing the best balance between increased resistance to compression and reduced void space. Therefore, this mix is likely to offer the most favorable engineering performance in terms of strength, settlement reduction and long-term stability of the marine clay.
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