Hybrid Applications of Fiber-Reinforced Polymers and Geopolymers in Soil Stabilization(enhancing Unconfined Compressive Strength and Shear Strength)

Soil stabilization is a fundamental technique in geotechnical engineering, aimed at enhancing the physical properties of soil to improve its load-bearing capacity, particularly for construction applications. This study investigates a novel hybrid approach combining Fiber Reinforced Polymers (FRPs) and geopolymers to enhance soil stabilization. FRPs, notably glass and carbon fibers, are known for their high tensile strength, moisture resistance, and durability, while geopolymers provide an environmentally friendly alternative with low carbon emissions and the potential for incorporating industrial by-products. The research focuses on stabilizing silty clay soil sourced from a construction site in Kharar, Punjab, with varying percentages of FRPs (up to 5%) and a constant 5% geopolymer content. The mechanical properties of the treated soil, including unconfined compressive strength (UCS), cohesion, and shear strength, were evaluated over curing periods of 7, 14, and 28 days. Results demonstrate a significant improvement in soil strength, with UCS, cohesion, and shear strength all reaching their peak values with a 5% FRP and 5% geopolymer mix after 28 days of curing. Beyond this optimal fiber content, a decrease in mechanical properties was observed, likely due to reduced bonding efficiency and disruption of the soil matrix caused by excessive fiber content. This hybrid stabilization method offers enhanced soil performance, providing a promising alternative to conventional stabilization techniques. The approach not only improves the mechanical properties of soil but also presents an eco-friendly and cost-effective solution. The findings hold practical implications for infrastructure projects in areas with unstable or unsuitable subgrades, and future research should focus on scaling up the application of this method and exploring additional materials for further enhancement.