Influence of Chemical Stabilization on Geotechnical Properties of Municipal Solid Waste

Challenges while redeveloping closed landfill sites include gas emissions and improving engineering properties. Many studies on the chemical stabilization of soils have been reported. However, stabilization for improving the properties of degraded municipal solid waste (MSW) has not been explored. This study reports the findings of experimental investigation to determine the geotechnical properties of treated and untreated MSW with fly ash (FA) and calcium carbide residue (CCR). The samples for testing were prepared by mixing degraded MSW with a mixture of FA-CCR with a ratio of 3:1. The study shows an improvement in the geotechnical properties of MSW treated with an FA-CCR. Maximum dry density was increased by 33%, and optimum moisture content was reduced by 38% at a 20% FA-CCR mixture. The permeability of an untreated specimen was 1.10 E−02 cm/s and reduced to 8.32E−05 cm/s. Samples mixed with 20% FA-CCR. It was also observed that by increasing FA-CCR mixture from 0 to 20%, the angle of shearing resistance increased from 16° to 27°, and cohesion increased from 21 to 30 kPa.