Using Sisal Fibers for Improving Soil Properties

Shear strength is a critical factor in geotechnical engineering, influencing the stability of foundations, excavations, and slopes. This study explores the potential of sisal fibers as a sustainable and cost-effective reinforcement for soil stabilization. An experimental approach was adopted, incorporating varying percentages of sisal fibers into soil samples. Instead of conventional shear strength tests such as direct shear or triaxial testing, an alternative procedure was utilized to estimate soil shear strength based on compaction characteristics, deformation behavior, and cohesion improvements. The results indicate that sisal fiber inclusion enhances soil stability and crack resistance, with an optimal fiber content of approximately 5–10%. However, the absence of direct shear strength measurements presents a limitation, and further validation through standard shear testing is recommended. Despite this constraint, the study highlights sisal fiber reinforcement as an eco-friendly alternative for improving soil properties, particularly in resource-limited regions.