Advancement in Properties of Clayey Soil using Sewage Sludge Ash And Plastic Waste

Abstract

In order to stabilize clayey soil, Sewage Sludge Ash (SSA) and plastic waste are added in different proportions to the clayey soil. Sewage sludge ash in values of 4% to 20% i.e. 4%, 8%, 12%, 16% & 20% by weight of the total quantity of clayey soil taken is mixed with the soil and test is conducted to determine optimum SSA content. Optimum SSA is determined by performing Standard Proctor Compaction Test.Influence of plastic waste strips on various properties of clayey soil treated with sewage sludge ash is also studied. The optimum SSA content obtained is used in clayey soil along with plastic waste strips with 1, 1.5, 2, and 2.5% by weight of the total quantity of clayey soil taken and optimum plastic waste content to be used is also determined. Tests such as Compaction, Atterberg’s limits, Specific Gravity, Unconfined Compressive Strength (UCS), and California Bearing Ratio (CBR) are performed to determine properties of clayey soil sample. The resultsindicate that Maximum Dry Density of untreated soil were greatly improved by the use of 12% SSA. Moreover, 1.5% addition of plastic waste in the form of strips enhanced the treated soil in terms of Maximum Dry Density.
Furthermore, the optimum moisture content was effectively reduced by the use of 12% SSA as compared with untreated soil and the 1.5% plastic waste strips fraction offered the best performance. From this study, we conclude that 12% of SSA replacement could effectively stabilize clayey soil, and 1.5% of plastic waste strips may be the optimum amount to add to the soil.