PERFORMANCE EVALUATION OF LATERITIC SOIL TREATED WITH WASTE MARBLE DUST AS A SUITABLE LANDFILL LINER MATERIAL
Abstract
This study evaluated the potential use of lateritic soil treated with waste marble dust (WMD) as a suitable material for landfill liners. The chemical analysis revealed that the WMD is rich in lime (CaO), imparting cementitious properties, while the lateritic soil exhibited a silica–sesquioxide ratio of 1.67, classifying it as lateritic. Laboratory tests assessed the effects of varying WMD content (0-12%) on the soil’s Atterberg limits, compaction characteristics, hydraulic conductivity, unconfined compressive strength (UCS), and volumetric shrinkage strain (VSS). Results showed that liquid limit decreased from 36.4% to 30.2% and plastic limit increased from 12% to 24%, maintaining LL and PI values above the minimum thresholds recommended for landfill liners. Maximum dry density improved to 2.11 Mg/m³ under BSH compaction, while optimum moisture content reduced, indicating denser soil matrices. Hydraulic conductivity decreased significantly across compactive efforts, achieving values as low as 8.42×10?? m/s, well within the ?1×10?? m/s requirement for liners. UCS values peaked at 340 kN/m², surpassing the 200 kN/m² benchmark, and VSS dropped below 4%, minimizing risks of excessive shrinkage. These findings demonstrate that 6 to 12% WMD-treated lateritic soil meets critical geotechnical criteria for landfill liners, offering a sustainable approach that simultaneously manages marble waste and enhances soil performance.
Keywords: Lateritic Soil, Waste Marble Dust, Landfill Liner, Hydraulic Conductivity, Unconfined Compressive Strength
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