Investigating Coconut Coir Fiber as a Soil Reinforcement to Enhance the Geotechnical Properties of Lateritic Soil

J. E. Sani, G. Moses, K. Adebayo

Abstract


This study investigates coconut coir fiber (CF) as a sustainable reinforcement to enhance the geotechnical properties of lateritic soil treated with CF at 0%, 2%, 4%, 6%, and 8% by weight, the soil exhibited notable improvements. Specific gravity increased from 2.61 (untreated) to 2.75 with 6% CF, while maximum dry density rose from 1.66 Mg/m³ to 1.76 Mg/m³ at 4% CF. Shear strength parameters, including cohesion and internal friction angle, improved significantly, indicating enhanced mechanical stability. The optimal moisture content and plastic limit were also influenced, suggesting better compaction behavior and workability. Microstructural analyses (SEM) revealed fiber-soil interactions that modified the soil fabric and elemental composition, reinforcing the matrix. The results demonstrate that coir fibers, particularly at 4–6% inclusion, strengthen lateritic soil by improving its density, shear strength, and structural integrity. As a low-cost, renewable material, coconut coir offers an eco-friendly alternative to conventional stabilizers, promoting sustainable practices in soil engineering. Its ability to enhance soil properties makes it viable for construction and infrastructure applications where stabilized soil is required, aligning with environmentally conscious engineering solutions.


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