Optimization of Geotechnical Enhanced Lateritic Soil stabilized with Bentonite and Ceramic Dust for landfill Liner application.
DOI:
https://doi.org/10.63746/njtd.v23i1.4223Keywords:
Bentonite, Ceramic Dust, Landfill Liner, Lateritic Soil, OptimizationAbstract
The rapid increase in Municipal Solid Waste (MSW) in urbanizing areas like Minna, Nigeria, necessitates effective landfill liners to protect soil and groundwater. This study optimized a mixture of bentonite and ceramic dust to enhance lateritic soil, focusing on hydraulic conductivity (K), unconfined compressive strength (UCS), and volumetric shrinkage (Vsh). Using Response Surface Methodology (RSM), mixtures of 0–12% bentonite and 0–10% ceramic dust were prepared under three compaction efforts at 13–23% moisture. The mixtures that met regulatory standards are: British Standard Heavy (BSH) compaction at 18% moisture, blends with 12% bentonite + 10% ceramic dust (K=7.9×10?¹? m/s, UCS=208.1 kN/m², Vsh=2.7%). Inaddition, Mixtures under West African Standard (WAS) and British Standard Light (BSL) at 18% moisture, particularly 12% bentonite + 10% ceramic dust, also achieved the required parameters. RSM optimization identified an optimum mix of 2.79% bentonite and 5% ceramic dust at 18% moisture. However, its Vsh (6.61%) slightly exceeded the threshold, indicating a need for further refinement to reduce shrinkage while maintaining permeability and strength. The study confirms that combining bentonite and ceramic dust is a viable, sustainable method for improving lateritic soil in landfill liner applications.
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