Eco-Friendly Soil Stabilization Using Glass Powder, Sawdust Ash, and Guinea Corn Husk Ash for Improved Geotechnical Properties in Highway Construction

This study explores the use of glass powder, guinea corn husk ash, and sawdust ash in stabilizing weak soils for highway pavement. Conducted in two phases, it first examined how different blend ratios affect soil strength and density. The second phase assessed how these admixtures influence key geotechnical properties, including Atterberg limits, compaction, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS). Tests followed BS 1377 (1990) standards. Admixtures were added at 1%, 2%, and 3% individually, totalling 6% combined by weight. Both treated and untreated samples were tested. Results showed that the blend significantly improved strength, reduced plasticity, and increased load-bearing capacity. These effects are due to pozzolanic reactions that enhance particle bonding. The findings suggest strong potential for using these waste materials in eco-friendly soil stabilization for road construction. However, further studies are needed to optimize mix ratios for different soil types.